There are several references to hip hop artist M.C. Hammer in the episode "Doug Can't Dance." In his imagination, Doug dances like MC Hammer while wearing parachute pants. Also, Roger dresses like a hammer for the school dance and shouts "it's hammer time."
"Doug Can't Dance" is considered the pilot episode
When "Doug Can't Dance" was expanded from the original pilot, certain new scenes (animated by Hanho in South Korea) were added to fill the typical 11 minute length. Among those was Skeeter twisting himself into a knot, Mr. Dink trying to put up the streamers and Skeeter being a DJ at the dance. These new scenes stand out from the older animation, as they lack the squiggly outlines on the characters.
This episode was the second produced episode of the series, but it aired first because Nickelodeon often airs episodes out of production order, becoming the series premiere. "Doug Bags a Neematoad" was meant to be the series premiere but was held off to the second episode.