For the ear wiggling that Stan does, he would be filmed with his ears as normal then they'd be held forward with putty or similar material and the camera restarted. The two sections would be joined together then copied and joined many times for repetition. Filmed in slow motion then projected at normal speed the ears would wave vigorously. This would be why Stan's face is fixed in one position for a relatively long time.
Look out for an early film appearance by future British horror film legend Peter Cushing. He is one of the students singing 'Fee Fie Fo Fum' and appears in a couple of other scenes too. He was just twenty-six years old when this was made, but is still easily identifiable despite having only a tiny role.
Stan's accent as Lord Paddington was nothing like his own native Lancastrian accent. Paddington was a mimic of other actors with whom he had shared the stage decades earlier.
During dinner in the late 1970s with an British TV producer in the city of Norwich, Peter Cushing fondly recounted his experience as an extra on this film and said his outstanding memory was of how concerned Oliver Hardy was about the welfare of the extras in the film and demanded that the producers arrange for towels and fresh clothes be supplied for the extras who got soaked in the pond scene and personally brought in a large tray of doughnuts for the extras to enjoy during filming.
In the movie's final scenes, Stan Laurel played a snob named Lord Paddington, the only instance after 1927 in which Stan Laurel played a role not related to his Stanley character.