"The List": What you can bet someone with a good Yeshivah education will get wrong.
#1 How long before Avraham did Noach Live?
#2 What is the Difference between Hashem and Elokim?
#3 What Happens to the Kohen who purifies the Tamei using the Parah Adummah?
#4 Why is makkat bechorot the ultimate plague?
#5 The Machloket between the Rambam and Ramban regarding whether "Anochi" is a mitzvah
#6 The post- Shemonah Esreh Dance
#7 Prayer begins with the Churban
How long before Avraham did Noach Live?
What is the basic difference between Elokim and Hashem?
What happens to the Kohen who sprinkles the water of the Parrah Adumah?
Why is makkat bechorot the ultimate plague?
The usual resonse is something along the lines of "hmm, wasn't Pharoah (or his son) a firstborn? Yes, but that is not the reason.
In Shemot (4:22), Hashem warns Pharoh that Bnei Yisrael are "my firstborn", and that if he mistreats the Jewish people, then his firstborns will be killed, as well! This is the reason that the Torah itself gives for the plague of the firstborns.
The idea that Bnei Yisrael are Hahsem's firstborn, the notion of God's special love for the Jewish People, is at the heart of the Exodus and Pesach. It is a theme that we explore in Amittah Shel Torah on Shemot.
The Machloket between the Rambam and Ramban regarding whether "Anochi" is a mitzvah
It is well known that the Rambam and Ramban disagree as to whether or not "Anochi..." in the asseret hadibrot is a mitzvah or not, We have all heard shiurim about this machloket, I even saw a discussion of it in a very popular contemporary sefer.
The only problem is that there isn't, and never was, such a machloket. In his commentary on Shemot (20:2) the Ramban explicitely states that it is a mitzvah, agreeing with the Rambam. He explicitely agrees with this position of the Rambam in his [the Ramban's] comments on Sefer Hamitzvot, Lo Taaseh #5.
Why then do so many people get this wrong? The answer is actually significant.
The Ramban "made a career" of defending earlier greats from the attack of later Rishonim. This is the reason d'etre of many of his works, as we know. It is important to note further that he does this even when he happens not to agree with that earlier giant's position.
[It is interesting to note that this then happened to him, when the great talmid of his talmidim, the Ritvah, wrote an entire sefer (Sefer Hazikaron) to defend the Rambam against the barbs of the Ramban- despite believing that the Ramban was ultimitely correct [because, as he put it, the Ramban was a Kabbalist, whereas the Rambam was "merely" a rationalist]! ]
In this case, the Ramban presents an eloquent defense of the Bahag against the critique of the Rambam. In his [the Ramban's] comments on Sefer Hamitzvot, Aseh #1, the Ramban presents extensive basis for the Bahag- leaving many with the impression that he agrees with the Bahag, and thereby disagrees with the Rambam concerning "Anochi". However, if we read his comments to the end, we find out that he is only presenting a justification for the Bahag. His own opinion will be explained later in [the Ramban's] comments on Sefer Hamitzvot, Lo Taaseh #5.There, as we mentioned above, and in his commentary on the Torah, he makes clear that he agress with the Rambam.
So, fear not! We can still say the same shiurim about the machloket. let's just get the facts straight and speak of the Bahag and the Rambam- not the Rambam and Ramban.
#6 The post- Shemonah Esreh Dance
Many people do a little dance at the end of Shemonah Esreh: 3 steps back, 3 forard and then a few hops. As popular as this dance is (even amongst knowledgable Jews), it not only has no basis in Halachah- it is, actually dead wrong.
The Gemarah [Yoma (53b)] says that after taking leave of God's presence and stepping back 3 steps, one must stand in place. It goes on to say that one who immediately returns to their place is like a "dog that returns to its vomit", It is safe to say that that is not a compliment!
The Shulchan Aruch brings this down l'halachah [Orach Chaim (123:1)]. For further discussion of the Halachic aspect, see Teshuvot Or Yitzchak Orach Chaim (#47). It is absolutely clear that it is improper to move forward before waiting for the time it takes to walk 4 amot or for Kedushah.
Why then the dance? I beleive the answer is simple. The Kuzari (II:79-80) explains that people tend to imitate those that are aparently more knowledgable, and often do so superficially and without understanding. If one sees a "good davener" who finishes their tefillah immediately before the shatz gets to Kedushah, they will see that he is moving forward immedialtely and then rising up for "kadosh kadosh..." The less knwoledgable person then- incorrectly- assumes that this is what we are supposed to do at the end of Shemonah Esreh! Thus is a "bad" minhag born!
#7 Prayer begins with the Churban
As everyone knows, now that we can no longer bring korbanot, we replace the sacrifices that we aught to be bringing with prayers. This is idea is clearly articulated by Chazal [e.g. in Berachot (26b).]
As a result of this, many many people mistakenly think that prayer begins with the destruction. I have heard this said in one from or another countless times.
This is gross ignorance. It is explicit, both in Tanach and in Chazal, that the opposite is true.
In the very lengthy prayer of Shlomo Hamelech, when he innaguates the Beit Hamikdash, he speaks at great length about how the Temple will be a center of prayer for all nations [Melachim I (chaoter 8)]. The same idea is expressed in Yishayahu (56:7).
The Gemarah tells us that due to the destruction of the Temple, the gates of prayer were shut [Berachot (32b)].
The reason for this is clear. We know that the essence of prayer is an awareness of standing before the Shchinah, standing in God's presence[see e.g.Rav Hai Gaon, Otzar HaGeonim Berachot (chap. 5)].It is obviously easier to have this awareness when there is a makom shechinah...
Prayer exists today despite- not because of- the Churban.

