In the flashback to Tony's youth where he sees his father beat up a man, young Tony is carrying a black-and-white composition book with a UPC barcode on the front. The flashback is set in the mid-1960s, but UPC barcodes were not introduced until 1974.
AJ and Tony are making sundaes and fooling around. When Tony was making a sundae he is using Pathmark brand whipped cream in a can. When AJ is in the kitchen and they fool around, the whipped cream turns into ReddiWhip.
When Tony finishes working out, the stairs go straight up and lead to a door directly at the top. When he's seen opening the door to the basement, he's on a landing and the stairs appear to go off to the right.
When Tony, Sil and Pussy were in the Bing playing pool and Tony asks Pussy if he had spoken with his kids about 'This thing of ours', there's a man and woman, presumably part of the film crew, behind Pussy. A man sitting at Sil's desk and a girl kneeling/squatting next to him.
When Big Pussy and Tony are playing pool the table is at a severe tilt. This is evident during Big Pussy's shot as both balls travel towards the left cushion and bounce along them as if the pool table is lifted.