During the series in flashbacks set before Felix moved in, Oscar had a stuffed gorilla named Bruce in his living room. In this movie, the gorilla's name is Stanley. (It's the same gorilla, because upon seeing it for the first time Felix says, "Ah, I see Stanley's back")
Jack Klugman's recovery from real life throat surgery was written into the story to explain the hoarseness in his voice.
Roy Clark performs part of his 1969 hit song, "Yesterday, When I Was Young."
The horse race action was actually filmed at Belmont Park. We see Felix and Oscar entering the clubhouse entrance at that track and later they are at the $100 window in the Belmont clubhouse. The footage of the start of the race clearly shows an "Aqueduct" sign atop the starting gate. Aqueduct is a sister track to Belmont Park run by the New York Racing Association and located about 5 miles southwest of Belmont.
In the fake subway set, the tunnel wall slides away behind the windows to simulate the motion of the train leaving and entering the station, but the station platform behind it doesn't move at all.
Felix photographs the centerfolds under the name Spencer Bennidict.
In the bedroom, Oscar says "You miss the ticking of the other CLOCK", instead of WATCH.
Contradiction: Felix has flown without fear in previous episodes, including "Felix the Calypso Singer" and "The Odd Holiday."
Oscar requests a maid with rosey cheeks singing "Supercalafragalistic expialadosis," aluding to Mary Poppins. Reta Shaw, who plays the maid, was in the movie Mary Poppins as Cook.
Oscar: Believe me, I'll win ya back!
Felix: No, you won't. You'll lose double or nothing and I'll have to bring in my brother from Buffalo.
This is a reference to his brother, Floyd, who would be seen eight episodes later in "Shuffling Off to Buffalo."
Blanche's maiden name was Somers (in a nod to the actress who played her, Brett Somers) and she came from Kew Gardens, Queens.
Continuity: Felix says he was always allergic to animals, but this was not the case in "And Leave the Greyhound to Us," where he says he loves dogs. Also, according to first season episode, "Engrave Trouble," he, Gloria and the kids had a Pomeranian named Spot.
In the episode "Password", as he's being dragged off stage Felix says that he has a home edition of the game in his glove compartment. However, it could be said he was only saying things at random to stay on the show, or perhaps he DID own a car, but lost it to Gloria in the divorce settlement.
Inconsistency: Felix gives their address as 74th and Central Park West, which puts it on the Upper West Side of Manhattan. In the second season episode, "Where's Granpa?" dialog gives the address as 1049 Park Avenue, which is on the Upper East Side, on the opposite side of Central Park.
This script was used nearly verbatim for an episode of the short-lived 1982 remake, The New Odd Couple.
This episode seems to contradict second season episode, "A Night to Dismember," according to which Oscar and Blanche's marriage broke up at a New Year's Eve party they threw.
Felix makes another claim to high school fame. He says he was voted "most limber boy." In earlier episodes, he claimed he was voted most likely to succeed and would have won "cutest boy" if he had not already won a home economics award.
Felix does a flatfooted leap onto Oscar's desk to prove he's fit. He performed the same feat for the same purpose in the second season episode "The Fat Farm."
Oscar says an army cot was Blanche's and his wedding bed. This is the first indication of Oscar's revised wedding story, later fleshed out in "That Is the Army, Mrs. Madison." Previously, Oscar had variously made it sound like he was at home and trying to watch an All Star baseball game or he had been married on Christmas day.
Felix was voted "the boy most likely to interrupt" in his high school yearbook. This is the latest in a series of claims from previous episodes, including "most likely to succeed" and "most limber."