-- There are 3 trees on one side of WEB Slingers. There’s a HUGE middle tree with average trees on either side. On either side of the huge tree is a pipe labeled gamma radiation, explaining why one tree is much bigger than the other two.
-- When you enter the WEB building, you'll see portraits of all the people involved in bringing the SLING/R vehicle to life: Doreen Green (Squirrel Girl), Lunella Lafayette (Moon Girl), Onome, Harley Keener (Tony Stark's young friend who appeared in Iron Man 3).
-- Keep your eyes open later in the queue and you'll see that Keener is also still playing with his potato gun and causing some issues for WEB.
-- In a WEB Slingers display case, signs for Lucky Dog's Pizza, a menu for the Shawarma Palace (inspired by the post-credits scene in the first Avengers movie), and a postcard (from Peter Parker's European vacation in Spider-Man: Far From Home) can be found.
-- In the WEB Slingers preshow, there is a claw machine in the corner that holds a pair of 3D glasses from the former attraction It's Tough to be a Bug.
-- The wall of lockers in the Web Slingers queue also gives nods to Harley Keener, Miles Morales, Gwen Stacy, and Mary Jane Watson.
-- In the pre-show for Web Slingers, the WD-40 on the table has been labeled WDI-1401