Cod: Finest Hour had some of the strangest and goofy Easter eggs in the entire series
Anywhere from Germans dancing, to weird hidden rooms to a giant apple you can drive through hiding a UFO and the Germans hiding a secret UFO. Man this campaign had it all.
I kinda miss when campaigns would actually have interesting and strange Easter eggs hidden throughout the campaigns. I remember enjoying the ones in WAW with the hidden Ray Gun and in BO1 with the hidden Thundergun in the campaigns.