In A Goofy Movie (1995), you can see in the diner scene that Goofy’s keychain is the Disney logo

In "The Peanuts Movie" (2015), the school paper's article about the talent show that Charlie Brown helped Sally win includes a quote from Sally claiming that she's going to Disneyland

In John Dies at the End (Don Coscarelli, 2012), time travel is a plot point. In David's house there's a DVD for Don Coscarelli's Phantasm V (2016), 4 years before its release on physical media.

In The Departed [2006], Dignam repeatedly refers to Costigan as a “Lace Curtain” Irishman. Lace Curtain Irish was a 19th & 20th century slur for a well off Irish person. (Shanty Irish was for poor).

In Shazam: Fury of the Gods (2023) this character is played by Michael Gray the original actor who used to play Billy Batson in the 70’s TV series Shazam!

John Wick - Chapter 2 (2017) The Female assassin who shots John Wick in the back is played by Heidi Moneymaker. She Stunt Performer and then wife of the movie's director Chad Stahelski

In Supercell (2023), when Will is searching for his storm-chaser dad on Google, Bill Paxton appears first. Bill Paxton also played a storm-chaser, Bill Harding, in Twister (1996).

In Puss in Boots: The Last Wish (2022), Puss can be seen running and carrying Perrito. Perrito makes a running motion, similar to how dogs air paddle when held above water.

In Titanic (1997) there is a split second scene shortly after striking the iceberg which shows a clock depicting the real time the titanic struck an iceberg on April 14th 1912

In The Lorax (2012), there's a shot of Teds converse featuring a logo for "Gru's Shoes" as well as a minion, a reference to Illuminations Despicable Me.

What about it?

Scene: When Ted first leaves Thneedville and approaches the Once-lers home.

In The Secret Life of Pets (2016), an advert for Sing (2016), another Illumination movie, appears on the back of a bus.