Very minor issue:
Deathking MAP41 has a warning message when loaded.
This can confuse players. Specifically, line #1023 has its third and fourth parameters set to 64 and 7 respectively, possibly garbage value left from a different special having been tried first. The third parameter isn't a problem because there's no sector tagged 64 in that map anyway, but both could be cleared.
Speaking of Deathkings warning message, MAP47 has four unconnected right edges (lines #1511, #1515, #1528, and #1534). Looking into it with a map editor, #1511, #1512, #1513, #1514, and #1515 are flipped the wrong way, but they make polyobject container cells so it's not too much of a problem. #1528 and #1534 are actually correct, but they're next to wrong lines and so it's them that the check detects.