So basically the bit is that Tom thought Guillermo was a producer and Guillermo tricked him into showing up in a King Kong costume because supposedly Leo dressed as a bear for The Revenant. Jimmy debunks that and then Tom chases Guillermo off stage. It's as awkward as it sounds.
Stop at 2:05 since the rest is just the trailer. Or don't watch it at all
what other embarrassing late night talk show appearances can you think of?