Things season 3 of Mandalorian forgot about or just decided didn’t matter anymore:
Cobb Vanth and his mod repairs
Din calling Grogu “buddy” or “pal”
The silver ball from the razor crest’s ship controls that grogu loves to play with
dealing with or finally letting Din understand why the dark saber is heavy for him
Din dealing with his beliefs and what it means to be Mandalorian for him (they randomly gave this storyline to Bo-Katan instead)
All of Din’s progress with droids, he called R2-D2 friend in BoBF but that was forgotten and he just hates all droids again in episode 6
Gave Grogu a piece of armor with Din’s symbol on it (indicating they are clan) and then never let Din see it and react to it
Having an entire story beat with Ragnar being Paz’s foundling then never having anything with Ragnar learning about Paz’s death