In Pixar's Cars 3, Lightning McQueen's racing number 95 is inspired by Toy Story's 1995 release year.
Lightning's number has been part of his identity since the first Cars film. Pixar chose 95 as an internal reference to Toy Story, the studio's first feature-length animated film, which was released in 1995. The same number appears as an Easter egg in other Pixar-related contexts.
The reference is separate from Lightning's fictional racing biography. Within the Cars story, 95 is simply his competition number and a key part of his branding. Outside the story, it connects the character to Pixar's production history.
Cars 3 preserves the familiar number while updating Lightning's look and circumstances. His training, sponsorship, and relationship with Cruz Ramirez evolve, but the 95 remains recognizable. This is why the answer is Toy Story rather than another Pixar film from the 1990s or a movie associated with racing.