Continuity mistake: After the fight between the Tramp, the Kid, the Bully and his young brother, our heroes retreat to the safety of their room. In the process the Kid drops his cap in the street and doesn't pick it up. When the shot cuts to the interior of their room the Kid suddenly has his cap once again.
Continuity mistake: After the Tramp has found the Kid as a baby, he sits down by a drain and contemplates dropping the baby in. He puts his cane alongside him, so that it is at right-angles to the pavement (pointing towards the camera). The shot changes, and suddenly it is now parallel with the pavement.