There was a thread or discussion in the old place about "dream" movies and some of their creators, Lynch was not very well-appreciated IIRC.
Honestly the only movie i saw from him felt a little disjointed in that regard, and seeing the other work of his camera men i can bet he just winds it on set, wouldn't be the first time especially if the cinematographer has bigger balls and debating skills than the director.
Would like to know more as a i highly enjoy that kind of visual intermission, also interpreted as psychedelic, that off-key does help the narrative even if a bit abstract at times. Problem is when it appears in canonical series as it can be interpreted or used as a canon-break for disgruntled fans, like how some claim that James Bond died in Licence to Kill because the movie changed dramatically into the improbable after said scene/break, but the most famous case would be Total Recall.