Other: When Alex shoots the harpoon and the old lady is returning to her apartment, Alex puts back the harpoon on the mantle and the rope of the harpoon is neatly folded back up. He wouldn't have had the time to properly do this by the time she returned.

Continuity: When Alex is lying on the hospital, you can see that, after the nurse checks his testicles, the light blue uniform changes from plain to crease several times.

Continuity: When Mrs Connelly gets trapped in the fire unconscious, you can see her body keeps changing positions between shots.

Continuity: After Alex installs the clapping machine, he can't get the TV to turn off while he is laying down, he has to stand up and jump while clapping. However, after Mrs. Connelly figures out how to use it and they are going back and forth, it works perfectly fine while laying down.