When Patsy goes with Gloria for a test drive, at first they are in a Mercedes E-Class, but when they pull up, the car changes to a Mercedes S-Class (both in exterior and interior shots).
When Gloria is dancing in her underwear and Tony is laid on the bed he has a cigar in his hand on one shot, when shot from the other angle the cigar has gone.
The position of the pull tabs of the Coke cans on the table change constantly (Up, Down, Open, Closed) when Ralphie is telling the story of how Jackie's dad "moved up to the 'A' league".
The information card for the painting That Carmela is crying in front of calls it "The Mystical Marriage of Saint Catherine" The correct title, translated to English is "The Holy Family with Saints Anne and Catherine of Alexandria" (1648) by Juseppe de Ribera (1591-1652). Depicted are Joseph, Mary, baby Jesus, Saint Anne, and Catherine of Alexandria.
Christopher tells Tony Jackie shouldn't get away with the robbery because he shot at him and Furio who are "made" guys. Even though he didn't mention Eugene Pontecorvo and Albert Barese, his point was made because even if it was just one "made" man was shot at, the shooter would be killed.
Even though Matush should've been wearing a ski mask, it's possible he deliberately didn't wear it because he never intended to follow through with the robbery.
When Gloria drives Carmela home in the Globe Motors M-B coupe, there is a Benzel-Busch dealer's logo on the back of the car as it skids to a halt in Tony's driveway.
Dr. Freid suggests to Tony that Furio should to the emergency room to treat his bullet wound but as a doctor Freid should know the emergency room surgeon would have to by law report to the police any gunshot wound victims.