There appears to be a sample of a seagulls call at around 2:40 and again at 3:10. However these sound different from those sampled on "Happy Cycling".
There are also voices in the coda of this track. Between 5:16 and 5:35 is a recording of a woman talking and laughing. She laughs (5:20), says what sounds like "You know, this won't last..." (5:22-5:24), "I didn't like ... that before (?) ... times(?)" (5:28-5:30), laughs (5:32). It sounds like a sentence of some sort but a lot of words drop out. These voices are sampled from an early 1970's anti-drug social hygiene film. [1]
There are unidentified "samples" of computer game like noises near the end of the track.
The guitar samples used in this track have a strange similarity to Bibio's "All The Flowers". It is known that Bibio's album, "Fi" was highly influential in the making of "The Campfire Headphase".
Technical References
"Chroma key" (or color key) is a technique used in video production to swap in a separate signal source over a particular chrominance range across the source video, e.g. in bluescreen cinema effects.
Cultural References
The title also seems to be a reference to a musical by Tim Rice and Andrew Lloyd Webber called "Joseph and the Amazing Technicolor Dreamcoat".