Director Chad Lowe had a recurring role in season 3 of Supergirl (2015) as Thomas Coville, a religious leader who created a cult with Kara/Supergirl as its central figure of worship.
When the Speed Force attempts to pull Barry away from Ramsey just before he wakes up, its lightning is yellow and purple, similar to that of Nora West-Allen.
The mobile decorating baby Nora's crib is adorned with her outfit's insignia. And her baby clothing is primarily purple.
At one point in his coma, Barry finds himself walking among the gravestones of everyone he failed to save, and stops before his own grave, which is a reference to the the famous novella, "A Christmas Carol" by Charles Dickens. Coincidentally, Barry made his first appearance in The Scientist (2013), which was followed by Three Ghosts (2013). Among the names on the gravestones were Leonard Snart, Eddie Thawne, Martin Stein, Henry Allen, Nora Allen, and Nora West-Allen.
Iris starts to write a version of the article covering Flash's disappearance in the Crisis of 2019, which viewers have been seeing since Pilot (2014). As of this scene, Iris is the show's third character to have a "My name is" monologue after Barry and Nora West-Allen.