When Bobby and Craig are in the gym after playing basketball, Bobby is laying down on the floor. Bobby's shirt is covering and then is not covering the bottom of his stomach with each alternating shot.
The Hassidic culture follow the observance of Kashruth. Strict laws involving prayer and food. Solomon who wares a Kippah (head covering) and has Tzitzits (fringes hanging out of his pants) automatically is eating Pizza which most likely is not kosher. Any orthodox Jew would question food origin automatically.
The soundtrack which made Moqtada get out from his room wasn't Egyptian. It was a Syrian song composed and performed by Syrian artists.
Some of the psychiatric patients in the hospital are wearing sweatshirts with drawstrings. Mental health facilities would not allow patients to have these. The staff took away Craig's belt and shoelaces, so they likely would not have allowed drawstrings in the hospital.
When Craig uses the pay phone for second time to call his best friend for ordering Egyptian music, he didn't insert any coins in it. In the earlier scenes, they clearly shows the coins sound while one of the patient gets off the phone.
When Bobby and Craig sneak to the gym to play basketball, you can see them wearing their shoes with the laces on, although we see these being taken away from Craig when he is committed and he is told that they can't allow patients in with their shoelace.
The record player is playing music but the tone arm isn't on the record.