When Iris shot and killed Savitar in Finish Line (2017), he was laying face up; in this episode, he's face down.
When Barry and Nora travel back to the events of "Versus Zoom", Iris checked on Barry after Zoom stole his speed. However, in the original episode, Iris checked on him before that happened.
After Zoom kidnaps Caitlin, Cisco runs and calls out to her. In this episode, he is shown looking from behind a closed door, which wasn't closed during the events of "Versus Zoom".
The time-line should have been severely altered when Barry and Nora's presence were sensed by Thawne on the night of the particle accelerator explosion. Because of the distraction, he turned the accelerator on a few minutes later than original. This would have altered what everyone was doing at the moment of the explosion and most of the metas' powers were due to what they were doing when they were struck by the dark matter, including Barry.
The time-line is now even more jumbled up due to the Time Wraith that showed up when Nora and Barry went back to the night of May 23, 2017 (Savitar's defeat) to get a shard of Savitar's armor. The Time Wraith followed them to the day Zoom stole Barry's speed and grabbed Zoom when he went after Barry and Nora. Zoom was taken by the Time Wraith at the wrong time; he was originally captured in "The Race of His Life".
Cisco breaches Cicada's dagger into outer-space, even though he's previously stated that he's unable to open breaches that reach into outer-space. However, it's possible that Cisco may have honed his powers enough since then that he can now manage this feat.
The synopsis states that Sherloque takes his concerns about Nora to Iris. In the episode though, he does this with Cisco, not Iris.
Zoom doesn't appear to recognize that Barry traveled back in time; when alerted to Barry and Nora's presence via their usage of the Speed Force, he didn't ask how Barry had his speed back, which he'd taken from the younger Barry moments earlier. After Barry lost his speed in "Versus Zoom", he didn't get his speed back until three episodes later, in "The Runaway Dinosaur".
Barry Allen says after him and Nora returns from the past, "Let's Go Get CK". The initials of actor Chris Klein who plays Cicada not the character.