During the flashback scene where Harrison Wells speaks to the public about the startup of the Particle Accelerator, there is a single frame out of sequence as it cuts from a two shot with Barry Allen and Iris West back to Harrison Wells.
When listing off DeVoe's "charitable qualities", Harry said that he volunteers at an orphanage. Orphanages in America had been completely replaced by the foster care system in the United States by the early 1970s.
Caitlin, and Iris, don't seem to remember Thawne (as Wells) interacting with the DeVoe's. Knowing what they did about Thawne, his interaction with DeVoe is suspicious and could prove Barry right about DeVoe. It is possible though that they simply forgot or didn't pay attention in the moment.