Frustrated by his soldiers' failure, Hody Jones orders the Kraken (Surume) to attack. However, Luffy recognizes the beast as his former "pet." After a brief moment where Surume seems to attack, it joyfully obeys Luffy and is tasked with protecting Princess Shirahoshi (IMDb).

Robin and Brook prevent Hody's men from reaching Shirahoshi. The anime specifically shows Robin using a new giant-limb technique to stomp out several attackers (Wiki). Anime vs. Manga Differences

A tank piloted by Nami, Usopp, and Chopper that effectively mows down large groups of enemies (Wiki).

Franky unveils the latest additions to the Thousand Sunny’s Soldier Dock System:

While the episode follows the manga source material, it adds several extended scenes: