When Oscar is building the coffin in his basement, he cuts a piece of wood off and leaves and approximately 45° angle in the larger piece. When he turns around to face his wife, the camera angle changes to show the front of the piece of wood he just cut and the angle of the cut is much greater.
The grocery store sign says "FOO AR ET" in this episode instead of the usual "FOO MAR T".
When Brent is unlocking the Corner Gas station, he walks in, and the sign is flipped to show "OPEN", although if the store has just opened the sign should be flipped to read "CLOSED".
Both plaid shirts featured in this episode have buttons on the left side, indicating they are in fact women's blouses, not men's shirts.
When the shelf in the coffin collapses you can see the hand of the person behind the coffin pulling the release pin.
When Oscar leans into the coffin at the funeral, the "deceased"'s eyelids twitch.