During the gun fight on the roof, Dunn got a bullet in his shoulder, and a kind of slime is dripping from it.
From scene to scene, the wound switches from left to right shoulder, and continues.
It can't be a reversed image, as Dunn's clothes text stays readable.
When talking to Capt. Lankett about the disappearance of Dunn's body, Det. Grayson calls Logan Lunar (Spaceport) "Logar Lunar".
Dunn enters the hotel, and take a room upstairs. Notice the stairs are in the opposite side of the entry door.
When he is looking by the window, one can say it's the 2nd or 3rd floor ; then Dunn jumps out and catch the hooker in the alley.
A few minutes later, one can see Cameron going down the same stairs.
But it's impossible, because at that time, he doesn't know yet the number of Dunn's room and he then asks the desk clerk.
And anyway, did he climbed the outside wall in first place ? That does not make any sense at all.