Continuity mistake: When Duane and Stewpot are following Pogo along the canal path they walk past a wall covered in a large mural but the angle changes when Pogo stops - Duane and Stewpot fall against a metal shutter that wasn't there before.
Continuity mistake: When Duane and Stewpot are following Pogo in the playground, the same two girls walk past them twice.
Continuity mistake: In the final scene when Pogo and his girlfriend get on a bus it is on route 260 to Hammersmith Broadway, but when they are on the bus waving at Duane and Stewpot from the back window it has changed to route 27 to Richmond.
Revealing mistake: In the final scene just before Stewpot and Duane spot Pogo with his girlfriend, at the start of this scene you can see a little boy jump up over the wall and wave to the camera.