Charlie tells the police chemist to blow the cigarette smoke into the beaker. It is not a beaker, but an Erlenmeyer flask the smoke is blown into it, while all are in the police laboratory.
The first time Tommy and Birmingham go into the weather tunnel, Birmingham accidentally turns on the hot steam, thinking it was a light switch. Instead of turning the switch off, they continue on, go through another door and end up in the blizzard tunnel. Later, when chasing the killer, Tommy and Birmingham go into the steam tunnel (it is turned off) while Charlie goes around to the other tunnel to trap the killer. This blizzard tunnel is on, but Charlie doesn't bother to turn it off, he just continues into the tunnel.