Jack mentions that Princeton sold his voice to things including Thomas the Tank Engine. Alec Baldwin actually was the narrator for Thomas and Friends (1984) from '98 to '03.
The new microwave is called the "TK421". This is a reference to Star Wars where Luke and Han incapacitate and wear the armor of a Stormtrooper named/numbered "TK421".
Frank's trucker hats say "Full Tank", "Speed Glue" and "Cream Sauce".