This is the only episode in the entire series to feature no 2D animation , instead being completely CGI-animated.
: Finn and Jake "hack" into the universal source code. After the virus eats Finn’s sword and their own limbs begin to delete, they defeat it by mimicking the hair-eating video. The virus, disgusted, regurgitates the consumed code and reality is restored. Notable Trivia
Clarifying "A Glitch is a Glitch" episode. : r/adventuretime
: The virus is delivered to Finn and Jake on a floppy disk taped to a brick. When they play it, they see a disturbing video of a woman eating her own hair—a real-life short film by David OReilly.
" A Glitch Is a Glitch " is the of Adventure Time (119th overall). Aired as an April Fools' Day special on April 1, 2013, it is widely considered one of the series' most surreal and experimental entries due to its unique visual style and guest production. Quick Facts