Dave Goelz, the Muppeteer who performs Uncle Traveling Matt is sitting next to Uncle Matt during the scene on the roller coaster. Goelz is performing Matt and has a false arm resting on the back seat.
While this was the fifth episode of Fraggle Rock that aired, it was the first episode to be produced, and served as the original pilot for the series.
When Traveling Matt rides on Rapid Transit he rides on the Wild Beast Roller Coaster at Canada's Wonderland.