Scorpio 1E's sand doesn't have the "poof" animation on slashing it.
Cancer 13 - The inside room has sideview gravity off.
I hit the switch on Cancer 7A, and the door on 62 didn't open for some reason. Can anyone confirm this? The door also doesn't have a door on the other side of the screen when you scroll into it.
The "Choose Sidearm upgrade" room on Gemini 0F doesn't offer anything. No text, etc.
Gemini 5E - Although you can bomb that one spot in the lower left, you can fall through the spikes far more easily to accidentally find the secret. It's how I found it.
The item room in Taurus: 21 doesn't release the item when you successfully pay the amount required to get the item.
The item room in Taurus: 44 doesn't release the item when you successfully pay the amount required to get the item.
Scrolling from Taurus 34 to 33 gets you stuck in a block.
Scrolling from Taurus 34 to 35 gets you stuck in a block too.
Can't get back up from Taurus 43. Probably isn't a bug.

The Taurus Corridor Boss from screen 15, when he does, reveals a bunch of ascending numbers.
The same boss also doesn't drop the screen's item.
After going to Taurus 72, (you don't have to go there to fix anything here.) it's evident that the missile upgrade item animates slower than the other two items when they're next to each other like that.
Taurus 73 - I appeared in the upper left corner of the screen after leaving the computer room despite the warp coordinates being properly set, and the exit being Stairs style A. Very strange. I wonder how that could have happened. I hope there's nothing wrong on my end. In a way, I hope there is.
On screen 25:27, there is a "NOT IN USE" item in the corner.
The string from 25:5D seems to pause the player at the end for some reason after the string disappears. Interesting. Actually, this happened on every string after I got the Red ring.
What's up with that switch on 23:49? It doesn't seem to link anywhere.
Can't get up from Taurus 5D if you accidentally found it without a way to get back up.
There is a bomb block on 7E that requires the Super Bomb but is colored like a standard bomb block. Same for the screen on 7F.
Taurus boss from 59 took a ton of damage after its health meter was emptied before it actually died.
On screen 49 of Taurus, there is an invisible unwalkable combo on the bottom edge of the screen.
Taurus 2B - Cannot get back up to 1B if you fall. -when- you fall. Ick. Is there even a point to that area that you can reach?
Strings:
332 - Propaganda
338 - convenient