Continuity mistake: When Tom is attacking the teddy in Harrods, the teddy changes positions between the CCTV and actual angle. Note the bear's feet in relation to the corner of the wall.
Continuity mistake: When being hit with the fruit, the wet patches on Tom's top keep changing place. (01:00:15)
Continuity mistake: When Peter and Benjamin fall through the trousers, Tom is nowhere to be seen. As they land on the floor Tom is behind the trousers.
Other mistake: When Tom hits the metal light and gets electrocuted, the light comes on. There's no reason for the light to come on.
Suggested correction: It is possible that light reacts to sound or movement.
Revealing mistake: When Tom is fired from Harrods, he is escorted out of the building. Look closely in the glass to the sides of the doors, mainly the screen right, to see a group of people just stood watching the film crew. There is a slight hint of a barrier visible around waist height but to spot the barrier you have to look extremely closely. (00:17:00)