Continuity mistake: Allen arrives to the market dancing and juggling potatoes. Behind Freddie there's a man scratching his nose. In the next shot his hand is down and he is raising it to scratch his nose again.
Continuity mistake: When Freddie, as a kid, is in the boat throwing the coins, a man in the background on the left side appears several meters to the right in the next shot. The second time he throws the coins, a guy next to the flag disappears between shots.
Continuity mistake: Before Allen asks his secretary if anybody called, she holds a yellow paper at chest level. Half a second later, when the angle changes, the paper is down and she is raising it again.
Continuity mistake: When Allen is fighting with Kornbluth at the dentist, the position of the large lamp in the background changes between shots.
Continuity mistake: At the wedding, Freddie throws coins on the floor and Allen scolds him. The position of the kids and adults behind keeps changing drastically between shots.
Continuity mistake: The position of the dentist's tools on the tray changes between angles.
Chosen answer: Whilst it may be a tad unusual, each system serves as a back-up for the other.
David Mercier