Corrected entry: During the episode, it goes back to 1968 and in the closing credits Eric is listed as being 7. However, he can't be because in 'Eric's Birthday' it was 1976 and he had turned 17. Thus in '68 he would have had to be 8 or 9 (depending on his birth) but certainly not 7.
Corrected entry: In the beginning of the episode where Bob and Red are competing with their Veteran's Day barbeques, Red is seen wearing the uniform of a Chief Boatswains Mate (BMC). However in a later episode where Kitty and Red are trying to remember how they met, in a flashback, Red is seen wearing the uniform of a Machinist Mate 2nd Class (MM2). Surely he advanced in rank, but I doubt he changed rates (jobs).
Corrected entry: According to the official website, Point Place is a suburb of Green Bay, WI. Midge can't make meat loaf for Bob because she is taking a class at a community college in Kenosha, which is about 2.5 hours away from Green Bay. Kenosha gets mentioned in other episodes as well.
Corrected entry: When Red tells Eric he can drive the car, and they are sitting in it together, Eric turns on the ignition and the stereo can be heard. That is how Red knows Eric drove it and grounds him for a month. But, earlier when Eric moved the car back into the garage before his dad came home, he would have heard the stereo blaring.
Corrected entry: At the 17 or 18 minute mark of the show, Hyde is doing dishes, Eric is behind him with a carton of milk, and Fez & Kelso sit at the counter as Kelso peels a banana. While Eric is griping that Hyde does too many chores around the house and makes him look bad to Red, Kelso takes a bite from that banana. You can plainly see that when he does this be breaks the banana, but when it cuts back a few scenes later, the banana isn't broken anymore