#1 - After damaging a window (putting one hole in it) the crowbar will not clear away the rest of the glass. Jumping through knocks the rest of the glass down but the crowbar just bounces off the cracked glass.
#2 - When Gman is shot blood will appear on his clothes. I don’t believe this happened in official Half-Life releases.
#3 - When breaking open some crates only a broken vent will pop out. I don’t know if that was intentional or not, but I don’t know who would store one vent in a giant box.
#4 - on C1A1D, during the lift sequence the headcrabs start dying automatically before getting near the lift once you reach 3/4 of the way down.
#5 - I brought up console to play with precache settings to stop stuttering and noticed I was receiving an entity error (ps. I found cl_forcepreload - I know that cl_precacheinfo 1 was dumb).