Shemot 6:28 says:
"It was on the day that G-d spoke to Moses in the land of Egypt"
The previous verses describe family genealogy and the next verse is what G-d said. I looked at Rash"i and Ramba"n and I understand the explanation that the Torah is attaching this idea to what occurred many verses earlier that G-d spoke to Moses, and then the story was interrupted, and now this is a "reminder".
Regardless of that explanation, I don't understand why the Torah has to "remind" people of anything. I don't think this technique is used anywhere else. Besides, anyone reading the Torah, can of course, scroll a column to be "reminded".
Then, this seems like an unusual way to phrase a reminder. "It was on the day..." We would expect something else to have occurred. All this verse says, "it was on the day that G-d spoke..." and the next verse it says, again, that G-d spoke to them. If we, in fact, needed to be reminded of the story, doesn't verse 29 suffice as being that reminder?
Perhaps, verse 28 is needed for some other purpose than a reminder of the story or a "transitional" verse, but I don't quite see what that is.