This One Time at Space Camp... - S4-E18
Plot hole: When Dr. Hughes is racing to save Allison when he thinks he is Carter from the events that happened in "I'll Be Seeing You" Henry says he is racing for a cliff, and that the cabin was just a hologram. But in the episode the Cliff was the hologram disguising the cabin. Henry even commented in that episode that he did not remember a cliff being there.
This One Time at Space Camp... - S4-E18
Other mistake: When Holly and Fargo are playing Dungeons and Dragons, Holly rolls a d20 die and yells, "Critical hit!" but we can see the 20 on one of the upper sides of the die, meaning that she actually rolled a 2, which is most definitely not a critical hit (and actually nearly a critical miss).
Continuity mistake: When Andy pushes Jack out of the way when the F.T.L. is malfunctioning he is pushed into 2 stacks of crates, they are seen all falling away from him. The next shot of him he is just falling against the crates and one of them falls on him instead of away from him and the other stack stays where it is.
Continuity mistake: Issac slips and falls on Jack's melted jeep - the shot changes and we see him fall again.
Continuity mistake: Before the launch when the countdown timer speeds up, the timer shows 21:09 and counts down to 21:00 then goes up to 21:59 instead of 20:59. Later the timer is at 18:08 and in the next shot of the timer it's at 18:18.
Continuity mistake: When Henry stops the countdown to launch, the time stops at 5 hours 13 minutes and 32 seconds. Later after the events at Cafe Diem the clock is stopped at 5 hours 13 minutes and 11 seconds.
Other mistake: When Zane and Andy get on the elevator, Jo is there to zap Andy. We see Andy start to fall backwards, and then we hear a thud as if he fell to the floor. When the shot changes, he's propped up against the wall. But he was standing too far away from the wall to land against the wall in that position.
In Too Deep - S5-E8
Plot hole: Carter is apparently just learning about Feynman's Day, which Allison explains as "Eureka's version of April Fool's Day." It's highly improbable that Carter could have lived in Eureka for five years and still be oblivious of this, especially given all of the hijinks that happen.
Revealing mistake: When Carter and Jo almost crash into the reflective smart dust wall on the road, Carter puts his hand up and waves it, to see his mirror image doing the same. Carter's mirror's hand movements are out of sync, which reveals that the "mirrors" are the actors, and the "real people" are doubles.
Chosen answer: It's basically just a type of suit that's made for whatever special project they're working on. No different than a lab coat, hazmat suit, fire coat, etc.