Some of the sequences are so admirably ambitious that it's easy to overlook their dip into the uncanny valley, but the quieter moments (like superimposing the two Barrys into the same frame) become unnecessarily glaring.

Source: https://comicbook.com/movies/news/the-flash-review-a-charming-cacophony-of-a-crisis-event/

When Bruce and the Barrys have a discussion about timelines, they point out that people are led to believe that time is linear, but it’s really not.

Source: https://gamerant.com/the-flash-easter-eggs-references/