New footage nvolving Zeltrax and evil Trent at the beach
Sentai
New
Sentai 
Mackerel in Island Fortress
The footage of Mackerel that plays on the Monitor is Sentai footage which includes this shot
Here's newly shot footage of a building in New Zealand
This background shot is Sentai footage however they edited Devin and Cassidy into the footage
Sentai 
New
Sentai
New
Sentai
New
Sentai
Sentai footage between Zeltrax and White Ranger on the beach.
New 
Sentai
Sentai up-close shot of a Fishing Rod/Pole
New
Rangers with Tommy arriving with 'em on his ATV
Sentai 
New footage of Mackerel 
Sentai
New
Sentai
New
Weapon combination sequence is stock Sentai footage. Once you see the Z-Rex Blaster Super Mode is when it's in regular Sentai footage.
The shots of these 2 Rangers as shown on Mesogog's Island Fortress Viewing Screen is new footage
Hydro Regenerator rain cloud is as per usual - Sentai stock footage.
New 
Here's Sentai footage of the wave hitting
This is back to Sentai footage with the White Ranger
Here's a shot of defeated Zeltrax on the beach... which is new footage

All Sentai footage involving Mad Mackerel as well as the challenge on the beach between Zeltrax and Trent comes from Abaranger 26.