The theatre's name changes from the Windsor to the Century and then back to the Windsor.
When we first see Chico in the final scene, he is wearing a bow-tie. In the very next shot he is tie-less.
The pocket that Harpo has the sardines in before he gives them to Maggie.
Faustino's response when he asks Harpo to "Clear your head"
Harpo lets go of the make-shift parachute when he whistles, while parachuting to the ground.