Mr Baldwin explains to the other teachers how he rewired the airbags on Nick's 1968 Camaro. However, Chevrolet didn't begin offering airbags on their cars until 1973.
It makes no sense for Mr. Romack to still have shards of the mug handle superglued to his palm. It is easily dissolved with acetone. Almost every teacher knows this because they need to be able to help school children who glue themselves up. Even if Mr. Romack didn't know, his colleagues would help him out.