1. The space suits used on the planet are a joke. Not only can you take your glove off, but the hood is not sealed!
They're not spacesuits, since Psi 2000 did have a breathable atmosphere. According to
The Star Trek Concordance, they were called anticontamination suits. Basically they were hazmat gear.
3- "The Enterprise is in a tricky orbit and we're spiraling down toward
the planet and it takes 30 minutes to regenerate the engines"?? Truth is It takes VERY LITTLE POWER to keep even a large vehicle in orbit, even if there is a shift in gravity.
Actually it takes
zero power to maintain a stable orbit. The Moon orbits the Earth; the Earth orbits the Sun; etc. None of them needs engines or thrust to do so. Orbit is a freefall trajectory -- essentially falling toward an object, but falling
sideways fast enough that your course loops around it over and over. (I like to paraphrase Douglas Adams: The secret to orbit is knowing how to throw yourself at the ground and miss.)
So yes, the trope used in many TOS episodes and other sci-fi shows of a ship losing power and falling out of orbit is basically nonsense. However, there is such a thing as a forced or powered orbit -- not a literal orbit at all, but using thrust to hold station over a particular location. Which might be necessary in order to maintain a transporter lock on the region your landing party has beamed down to, or to maintain sensor contact with a particular area you're studying. In such a case, losing power would cause a ship to fall out of its orbit.
Alternatively, if an orbit is low enough to impinge on the outer atmosphere of a planet, that can cause drag that slows the orbit. This is why satellites and space stations tend to fall out of orbit after a few years if they don't use occasional thrust to cancel out the drag (this may be what you were thinking of). It's hard to see how this could cause a starship's orbit to decay in a matter of mere hours, but a starship does have more area and thus more drag than a satellite, and the heat and radiation from its engines might turn the air into plasma and increase its drag (since the hotter molecules are hitting the ship harder and imparting more force).
NO, NO, NO! This episode sacrifices science and common sense in the name of drama like no other!! ~ Atoz
Oh, there are far worse ones. "Wink of an Eye" springs to mind. If they were sped up so much, how could they feel gravity? It would take them subjective hours to fall. How could they push through the air molecules that would resist their movement thousands of times more than usual? If they could, it would create hurricane-force winds inside the ship. How could they talk to each other, since the speed of sound between them would be subjectively thousands of times slower than normal?
Not to mention any episode involving incorporeal consciousness or mind-switching. Or the magical psi powers that countless TOS characters had.