Continuity mistake: When Joe and Iris are going to talk to Matthew Kim, Iris is already wearing the suit that Cisco later makes for her, she just wears it open the first time and closed the second time. (00:13:41 - 00:29:50)
Continuity mistake: When Cisco opens up a portal, Caitlin and Dominic are next to it and seen moving towards it, with Ralph standing in front of the group (as if he's covering them). In the next shot, Caitlin and Dominic are going through the portal followed by Cisco, but Ralph is nowhere to be seen as he's already entered the portal. There should be no way for him to completely enter the portal first.
Continuity mistake: When Iris covers herself with the blanket, the blanket is off her left shoulder, and you see her dress strap. Later the blanket is fully covering her shoulder. The blanket changes a few more times in later shots.
Chosen answer: No one can explain how time travel works. If by committing suicide Barry's mom survived, then there would be no Flash nor Eobard Thawne. So Eddie wouldn't commit suicide in the first place, because nothing would have happened.