A parody of the TV show Twin Peaks (1990). A scene where Bushroot's body is wrapped in plastic and tossed down the river mimic's that of Laura Palmer's fate in the aforementioned show.
The alien cow says that she is "from the planet Larson, on the far side of the galaxy". This is a reference to Gary Larson's comic "The Far Side".
Launchpad talking to/carrying a log is a reference to the Log Lady, one of the characters in Twin Peaks (1990).