In the scenes with the Mock Turtle, his legs are crossed in all the long shots, but in close-up shots, his legs are in a completely different position; without there being enough time to have changed them from one shot and another.
After the caucus race and the prizegiving, there is a shot with Alice on the left of the screen and the Mouse (Alan Bennett) is walking away out of the courtyard, which cuts to a reverse angle with Alice on the right. In the reverse angle many extras are standing in a completely different order, particularly the young man in a boater and pale suit contrives impossibly to be behind Alice in both shots. The young man in dark clothes who put a hat on in the previous shot is bareheaded again in the later one.
At 54.45, as Alice [Anne-Marie Mallik] is walking across the beach, she stumbles as her right foot steps into an unseen hole under the water.
When the Mock Turtle is singing, the sound does not match up with his lip movements.