Big Eater: Implied. He seems disgusted with Felix's meatless food and, after being on a juice cleanse for an entire episode, eats a prop burger with no hesitation.
Deadpan Snarker: Has been known to get a snark or two in. Mostly happens with Oscar, though really no one is spared.
Adaptation Name Change: Felix's ex-wife was named "Frances" in the original play, both films, and The New Odd Couple, while the 1970-75 series renamed her "Gloria", making this the second name change she's gone through in the franchise.
Spell My Name With An S: Conflicting sources list two different ways her first name is spelled: the original pilot script reads "Gabby" while the Wikipedia page reads "Gaby".