Episode 2 should have been in the Kizuna movie, it's very rare for the Digimon to seriously talk among themselves and it works wonders for their character to see them come to terms with what they most likely accepted at that point would end up being the climax of the movie.
Episode 3 Showed how Joe's grown up despite what Gomamon thinks at first which feels bittersweet because it shows how Gomamon is no longer keeping the one keeping Joe in check, kind of strangely like a mother watching their kids move on and live by themselves.
Episode 4 was a fun comedy one that showed us the OG Adventure Digital World and was just a cute bit of the Digimon goofing about as well as a neat call back to when Daisuke tried to get Veemon to evolve in 02.
Episode 5 is a comedy skit featuring Pumpkinmon and Gotsumon which I'll treat as non-canon because it retcons Pumpkinmon and Gotsumon's death in Adventure as them faking their death.
