Page 76. " She and old Marty were drinking Tom Collinses-in the middle of December, for God's sake. "
Tom Collins
Creative Commons AttributionTom Collins - Credit: Lu, Flickr

That Holden, at sixteen, knows a Tom Collins is a summer drink, while the thirty-somethings from Seattle don't, gives readers an insight into Holden's wealthy and cultivated family background.  

Like a Gin Fizz, the main ingredients are gin, lemon juice and club soda.

Try a Tom Collins with this recipe.  Not in December, for God's sake.

Page 79. " She was sort of muckle-mouthed. "

Meaning she had a wide or crooked mouth.  Holden's talking about Jane Gallagher, whose muckle mouth he likes very much.  At least she wasn't named for this feature, as Robert Browning's Muckle-Mouth Meg was:

“Life’s sweet; shall I say ye wed Muckle-mouth Meg?”/ “Not I,” quoth the stout heart: “too eerie/ The mouth that can swallow a bubblyjock’s egg:/ Shall I let it munch mine? Never, dearie!

Page 82. " Ernie's is this night club in Greenwich Village "
Street in GreenwichVillage
GNU Free Documentation LicenseStreet in GreenwichVillage - Credit: Urban

Greenwich Village is lower Manhattan's artsy, bohemian neighborhood, especially popular with the Beatniks in the 1950s (Allen Ginsberg, Jack Kerouac, etc.) and folk singing hippies in the 1960s (Joan Baez, Bob Dylan).  Check out its many fine alleys.  

Less bohemian now, but still buzzing, Greenwich Village is home to many excellent restaurants, music clubs, art galleries and sex shops. 

For an idea of the 1960s vibe, listen to The Roches talk about Folk City, the legendary Greenwich Village music club, and sing their song Face Down at Folk City.

Listen on Spotify

 

 

Page 95. " all he did in his spare time was beat women off with a club "

Happy caveman
Creative Commons Attribution Share AlikeHappy caveman - Credit: Jamin Gray
Meaning he (Monsieur Blanchard) was popular with women.  No actual beating with clubs involved.  Not even the French go in for that.

Page 98. " He was in that pitcher with Mel-vine Douglas? "

Freddie Bartholomew
Public DomainFreddie Bartholomew
Sunny is probably referring to Captains Courageous (1937), where Freddy Bartholomew plays Melvyn Douglas' son, who falls overboard when a prank goes wrong.  Holden couldn't be as young and cute as Freddy Bartholomew, but his character may be similar to that of Harvey Cheyne, Bartholomew's character in the film (see this review, in particular the description of Cheyne).  So Salinger might have been indicating to his readers, who would have been more familiar with the film than we are, that Holden is going through a similar immersion and transition as a result of his brother Allie's death, and the grief he still carries.

The film was based on a novel by Rudyard Kipling.