Continuity mistake: When Arnie and Jay arrive at their grandmother's candy store to stay with her, their Aunt Bella is making ice cream sundaes for them. Watch the whipped cream and cherries on top of both sundaes, they go from melted to fresh again between shots.
Aunt Bella: You guys have to promise not to tell grandma! Jay?
Jay: I promise.
Aunt Bella: Arty?
Arty: She and I have very short conversations.
Jay: Where would someone like Grandma hide her money?
Arty: You're not thinking of stealing it, are you?
Jay: No, but what if we just borrowed it? I'd just love to send Pop an envelope with $9,000.
Arty: Who would he think sent it to him... God?
Jay: No. He had an uncle in Poland who died. We can say he left the money to Pop in his will.
Arty: Jay, do you think the Germans would let some Jew in Poland send $9,000 to some Jew in Alabama?