It’s been pointed out already, but in this episode in particular, they lacked expertise when it came to every single challenge. Their scientific method would also claim that since neither Adam or Jamie can run 100m in under 10s, any “myths” saying so must be wrong and busted.

Noisy magnets? Use electromagnets

Noisy suction cups? Being unco isn’t a scientific variable. I personally saw it as plausible apart from the fact that Adam has no real upper body strength and control over his decent.

Cosmetic Powder? Once again, proved plausible. The error was with Kari’s technique. Furthermore, with IR goggles, powder would work just as well (scatters light into goggles)

Night vision goggles? I’m lacking knowledge in this department, but I’m led to believe that NV goggles would intensive the scattered light from the lasers (Similar principles to above).

Laser Replacement? Too difficult in real world situations? Subjective opinion, which is wrong from the get go.

Glass cutting and suction cup? I guess these guys were in the special children’s class while growing up because they kept trying to put a square block in a triangle shaped hole…

Pressure Plate? Although it’s a crude technique, it’s not scientific to rule out the myth because the cast weren’t skilled enough to prove it possible.

Cracking Safe? Unskilled staff, blah blah, same fallacy once again.

#1 Why did Mythbusters try to suck the small glass circle out with huge suction cup? stupid.

The movies correctly show that you cut the circle around a smaller suction cup or otherwise attach only to the circle to be removed. The suction handle is only to keep the cut section from falling and not to break the scored section free by suction.

Movies usually omit the part where you tap or press at small points around the edge of the circle to break it the rest the way through. I suspect you could use a wooden or rubber covered steel mini-mallet to tap the glass free more silently.

It is however sometimes difficult to break out circle intact. Glass breaks more easily and cleanly along straight lines. Sometimes professionals will attach smaller suction cups yet then score pie slices or chords then break out 3-4 sections of circle.

#2 Glass drills are not just ordinary drills although experts might get away with improvisation. The key thing is that the drill needs dampening mechanism to prevent shattering the glass. Vibration is bad.

Watch the UTube video with guy using glass keyhole saw on fish tank. Note that even with actual glass drill you usually use a wooden block to hold the bit in place and give further dampening. There the drill bit appears to have a nylon damper in the center of the key drill.

It’s already been done several times in the eighties, by Dan Goodwin.