Grogu force jumps into Peli's arms, prompting her to ask, "Now who taught you how to leap like a Lurmen, huh?" The Lurmen are a small, monkey-like species seen in Jedi Crash (2009). They are indeed extremely agile - and in fact, at least one Lurmen was Force-sensitive, so it's quite possible some boost their natural agility with the Force.
Bo-Katan makes a mention of her family. During the prequel era, the Kryze clan was the royal family of Mandalore. Bo-Katan recalls taking the Mandalorian Creed while her father looked on, making him proud as she did not embarrass him. The comment is an interesting one, because it could imply he considered Bo-Katan's sister, Duchess Satine, an embarrassment. She was a pacifist and friend of Jedi, who even gave Obi-Wan Kenobi the nickname "Ben".
Boonta Eve was first introduced in Star Wars: Episode I - The Phantom Menace (1999). It's during this holiday that Mos Espa hosts its annual podrace, the same one Anakin won to earn his freedom from Watto.
In The Clone Wars, Concordia was shown as the home base of Death Watch, led by Pre Vizsla. This tracks with why Din was raised there, due to his induction into Death Watch during the time of the Clone Wars.
R5-D4 was introduced in Star Wars: Episode IV - A New Hope (1977), one of the droids seen on the Jawa sandcrawler. Rae Carson's "The Red One," published in the anthology book "From a Certain Point of View", revealed R5 deliberately sabotaged his own motivator because he believed R2-D2 needed to be sold to the Lars family. There have indeed been reports in books that he subsequently served in the Rebel Alliance, although Peli Motto could be overstating his significance. Without R5, Luke Skywalker and R2-D2 would never have met.