Hey guys,
I'm a big fan of the under in select spots throughout the regular season, specifically Week 1. The Under in NFL Week 1 has gone 142-122-7 since 2005 (53.8%), and it seems like eager bettors tend to overinflate the point totals, especially early on in the season. Between 2005 and 2021, NFL Week 1 has an average Over/Under total of 43.92 compared to an average actual point total of 43.42.
I know these numbers aren't hugely drastic, but the sample size is pretty good, and it might be valuable when taken in context.
Here is the link to the data page on a site I started: https://trendsagainstthespread.com/over-under-by-week/