There really is a fascinating connection between Donnie+Darko and Source_Code. Both stories/movies are about the protagonist being in alternate realities.
DONNIE DARKO Trailer (2001) | Jake Gyllenhaal, Sci-Fi https://www.youtube.com/watch?v=b7Wybiuvq3g , https://www.youtube.com/c/joblo/videos
DONNIE DARKO: Is It Deep or Dumb? – Wisecrack Edition https://www.youtube.com/watch?v=xksMpeMHbTE
Donnie Darko Explained: The Ending & What It Meant https://www.youtube.com/watch?v=_ZrPYryNhWs The Take
Source Code (2011) Official Trailer - Jake Gyllenhaal https://www.youtube.com/watch?v=mnJegNyAb1w
https://www.rottentomatoes.com/m/source_code , https://www.rogerebert.com/reviews/source-code-2011
https://tvtropes.org/pmwiki/pmwiki.php/Film/SourceCode
Both movies are a variation on the time travel (TT) theme.
How Many Multiverses Are There? https://www.youtube.com/watch?v=1jmNzlTd09E
Is Reality a Controlled Hallucination? - with Anil Seth https://www.youtube.com/watch?v=qXcH26M7PQM
The Believing Brain: Evolution, Neuroscience, and the Spiritual Instinct https://www.youtube.com/watch?v=p0_-7FmrDq8
The Reality of Reality: A Tale of Five Senses https://www.youtube.com/watch?v=S1jn86eUX0E
Donald Hoffman Proves That We Live in a Simulation https://www.youtube.com/watch?v=iAfjsktMXu8
Do we see reality as it is? | Donald Hoffman https://www.youtube.com/watch?v=oYp5XuGYqqY
https://thedigitallabyrinth.blogspot.com/search?q=Donnie+Darko
https://thedigitallabyrinth.blogspot.com/search?q=Source+Code