Hmm... this isn't really a goof, more of a story oversight...
Dewey's moved to the Busey class in 5x18, so logic would have it he's still in that class for 5x19 - but in 5x19, Dewey's "class" are supposed to be selling chocolate bars. Given how the Buseys are treated and that they're given hardly any opportunities - Hanson is even rebuked for "learning something" - how likely is it that they're asked to go knocking on neighbours' doors selling candy bars?
I know it isn't important, but it was annoying me.
Another example is in 604 Pearl Harbour. when the class were given the homework assignment on their personal hero.
Yes in the early seasons things like this happen now and again, at the time it was broadcast 4:3 so the hand would be cut off, also I think the monitors they where using where 4:3 even though the film was 16:9 widescreen.
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I found another one. In episode 18 of 4th season, Lois is in the last month of her pregnancy. This didn't seem to bother her and Hal. They had sex in the hotel. MITM crew obviously didn't know that pregnant women can only have sex before 4th month of pregnancy.
I was watching the Pilot episode and this caught my eye. There's an apron that says Lloyd's with the same button "The L Stands For Value". Was Lois originally going to work for Lloyd's instead of the Lucky Aide?