When Tim wakes up to feed the baby at night, he smashes the light, but it stays on.
When Tim plays Mario Kart: Super Circuit the sound effects are from a different game.
In Tim Avery's final confrontation with Loki, he takes off the mask. In the next shot, he isn't holding it.
When Tim Avery tells Loki and his dad Odin that they should be happy together, he doesn't have the mask. When he says, "Here, you know what? Just take it," the mask appears in his hands.
The first time Loki looks through the mask's eye holes, nothing is printed on the back. Later, when Loki looks at the back of the mask, "Made in Taiwan" is printed on the back.
At the end, when Odin walks with his staff, it sounds like it hits the floor only 3 times, but it hits the floor several more times.
During the "Can't Take My Eyes Off You" musical number, when Tim begins wearing the white suit and tie near the end of the song, the shadow of the camera and cameraman are clearly visible on him for a moment.