In S1 E3, we all know that Sarah Lynn shows back up into Bojack’s life after a public mental breakdown. During the drive to the hospital after she stabbed herself, Todd expresses concern and says “She is losing a LOT of blood Bojack!” Bojack just replies with “beautiful day though, right?” This may not have been intentional, but I think that was already foreshadowing him waiting 17 minutes to call 911 during her OD in S3. He’s definitely not driving her as fast as he could be with that sentiment.
It also feels like foreshadowing after prom with those kids that when the girl has alcohol poisoning, he doesn’t want to take her to the hospital for fear of getting caught, and he only does because Pete Repeat insists.
And maybe it’s just a coincidence, but it seems interesting that this scenario (young girl passed out sick from a substance Bojack gave) repeats itself twice in the show, the first time with a character called Pete Repeat + this repetitions of 17. I think they writers really wanted to emphasize that Bojacks behaviour has been a pattern.