The Flash 4x02 definitely needs to take place before Arrow 4x02. (spoiler button isn't working right now, so I'll directly write it below)
An article says "Mayor Queen is the Green Arrow". This was claimed at the end of Arrow 6x01, and Oliver got clean at Arrow 6x02.
And not fully sure of it...
Chronicles of Cisco Post 50 probably takes place before Flash 3x12's last scene. In the post, Cisco talks about him and Wally "pining for their other-Earth baes" (Gypsy and Jesse). But Jesse's return occurs in 3x12's last scene.
(And by the way, @selfishmisery do you want me to keep writing...
In Supergirl 2x11, Kara mentions of her Earth birthday, which was in December 15. And Supergirl 2x09 was roughly a week after Invasion! So 2x09-2x11 should probably be in between Invasion! and The Flash 3x09 in the timeline.
Some notes I took while reading Adventures of Supergirl
There's a week between #3 and #4.
#7 takes place a week after Supergirl 1x06 and three weeks after #4
#7, #8, and #9 take place in the same day
Which order do you suggest to follow? I've came near to the finales of Arrow S3 and Flash S1 with the detailed one, and that 3x03 and 1x04 was the only error in the detailed timeline I caught so far. There are a lot of differences among the detailed and the simplified orders especially after...
It's been two weeks since I watched those episodes (I forgot to write here earlier), and if I remember correctly, Arrow 3x03 needed to take place before The Flash 1x04. Because the last scene was hinting the mini crossover. Felicity was learning that his friend has woken up from coma and was...
Yeah but what about DeMatteis' statement? Sorry if I sound too skeptical, but the only thing I could find was this: https://www.cbr.com/dc-showcase-shorts-sgt-rock-adam-strange/
I really doubt that it's in 2026 or something. I can see it as a slightly different parallel Earth or a divergent Earth (if it's not entirely separate in the first place), but not as post-Flashpoint DCEU. If it's canon, then various characters that weren't shown in DCEU, such as Green Lantern...