When Larry enters the garage at his new home, thinking it is the bathroom, he reaches for the light switch. We see four light switches in the garage, but we hear/see five light switches being flicked and five lights coming on.
When Larry goes to the bar in his new office, he picks up a bottle of Johnnie Walker Black Scotch and calls it "the good stuff". Johnnie Walker Black is actually only a 12-year old Scotch and is one of the lower quality Scotches in the Johnnie Walker family. It would have been more appropriate to have him pick up a bottle of Johnnie Walker Blue which is a 60-year old Scotch.
In the flashback to the All-State High School Baseball Championship, the announcer states the game is in the bottom of the 9th with the visiting team up 3-2. High School baseball games have 7 innings. However, this could be incorrectly regarded as a goof as the game could have been in extra innings. This was not mentioned by the announcer.