Egg Rock Core's hole in the wall/floor.

[TheDoctor]

On the floor part of the walled barrier, I found this little hole:

Spoiler: picture

 

[Deadpool The Hedge..]

I noticed that sector error also, it's a unclosed sector.
I don't think no one reported it yet though.
There's also another unclosed sector in Silver Cascade Zone.

It's also a texture error also.
Someone had to copy and paste the same flag sector in different places and messed up the FOF.
Don't know if anyone reported this niether...

 

[K.S.]

Look, as long as we're using the Doom engine, slime trails are going to exist.

It's not an unclosed sector, at least not in the editor's sense.

 

[DoomGamesLover]

As far as i know ZDBSP's extended nodes (supported by ZDoom-derived source ports but also by PrBoom+/GLBoom+ and Eternity), use fixed point coordinates for vertex position, allowing to greatly reduce the loss of precision for compatible source ports.

 

[Mystic]

SRB2 isn't related to any of those source ports, though. SRB2 uses vanilla Doom nodesbuilding, just without a blockmap, which is generated at run-time.