Part of Nintendo's E3 1996 B-Roll (recently digitized by VGHF) includes early footage of Mario Kart 64, then known as Super Mario Kart R! In this clip you'll find a different title screen, different character icons, and Kamek the Magikoopa as a playable racer.
In Mario Kart: Double Dash, shadows in the environment do not follow any kind of lighting logic and appear to have been placed solely based on "vibe". This results in shadows being cast in nearly every possible direction at the same time.