Continuity mistake: When Tommy says to the ooze men about them meeting Saba, the Rangers' positions all change instantly. (00:26:00)
Revealing mistake: Just as Tommy throws his knife pay close attention to the upper left of the screen. You see a very quick glint from the wire used to support the knife in the shots of it flying on it's own. Slo-Mo may help but is not essential to spot this mistake. (00:26:45)
Revealing mistake: When the Rangers de-morph we see them looking at their hands and bodies. However, when the actual suit disappears, their hands, arm and even heads are in different places. This is really noticeable with Billy. His suited hand and unsuited hand, while the same hand, are about a foot apart. (00:27:20)
Visible crew/equipment: Just as the rangers run off from the construction site after losing power, the camera goes in for a close up on the ooze. When it does you can make out the camera shadow in the bottom left of the screen. (00:27:50)
Revealing mistake: When the last 3 Tangu warriors fly off to find the Power Rangers, one of them knocks the wall of the cave, which visibly moves. (00:33:35)
Revealing mistake: When the Rangers are attacked by the Tangu Warriors, Aiesha summersaults to avoid one and slams into a boulder, which then wiggles like plastic. (00:36:15)
Continuity mistake: When Ivan starts the ooze pumping at the toxic chemicals plant, when the shot changes, the ooze is clearly water. (00:36:20)
Continuity mistake: When fighting the Tangu warriors, we see Kim get lifted away. Adam is on his own on the ground. Camera cuts to show a warrior is right next to him. (00:37:15)
Continuity mistake: Dulcea starts spinning the sticks to drive away the Tangu warriors. First off she is spinning the sticks in her hands. Camera changes and now she is holding a handle to spin them. (00:38:00)
Continuity mistake: When the Rangers are first talking to Dulcea, the front view shows her standing up straight, but the back view shows her knees bent. (00:39:20)
Continuity mistake: When Ivan is showing off his ooze to the kids, we see a shot of the kids from the back and there is a girl with a cap covered in numbers. Behind her slightly is Fred in a white shirt and black cap that is on backwards. When we see the kids from Ivan's point of view, the kids have moved. Fred isn't by the girl anymore but is at the back in the centre of the crowd. (00:40:50)
Visible crew/equipment: When Fred is examining his ooze, the camera moves in for a close up and the shadow can be seen moving over Fred's face. (00:41:35)
Other mistake: When Ivan Ooze gives out those slimes to the kids, that boy is at the very back of that big crowd. As Ivan Ooze starts giving them out, it switches to the boy and he already has some slime, but it would have taken a few minutes for him to get one. (00:42:00)
Continuity mistake: When Fred's father pulls into his driveway, you can see the raised part of the dashboard where the steering wheel, odometers and such sit, on the lower right side of the windshield. Then when he gets out of the car, he climbs out of the left side and you can see there's no steering wheel there. (00:43:00)
Continuity mistake: When Fred's father arrives home, the street is empty. But after he is zombified not even one minute later, the street is filled with people. (00:43:45)
Continuity mistake: Dulcea brings her hands together when she pours the powder into her hand to call upon the Ninjetti Animals, When she turns, she brings her hands together again. (00:44:55)
Continuity mistake: When Tommy first touches his Falcon emblem, his hands' position on the emblem changes between camera angles. (00:47:45)
Continuity mistake: When Fred comes home to find his dad, the position of the items on the counter change place. Notice the ooze. The container is at an angle to the side of the counter then parallel to the side of the counter. (00:48:00)
Visible crew/equipment: When Tommy is attacking the dinosaur skeleton with a stick you can see some kind of blue equipment or maybe the operator inside the thing as it turns its head towards Tommy. (00:53:20)
Continuity mistake: When the rangers find the temple, we see Kimberly jump up the few step in an overhead shot. Camera changes to Tommy and she climbs the steps again in the background. (00:57:40)
Answer: They weren't even considered to appear in the movie considering there were so many other changes (different suits, new Command Centre etc). Also the movie has been widely accepted as out of continuity with the TV show, so their disappearance doesn't really mean much.