First pitch was at 1:20pm and posted air temperature in Wrigley Field was 91º, but I'm sure the on-field temperature was considerably higher. Well, with a game going over 3 and a half hours in that heat, PU Hunter Wendelstedt is showing off a white cooling towel draped over his neck and shoulders while the game is going on! He's also keeping the movements to an absolute minimum. Lineup changes are being handled by one of the BU's (I think it's Guccione).
Players are dropping out due to heat fatigue.
If there is a note in the MLB Suggestion Box that recommends having the umpires in shaded positions with good sightlines, and referring to Video Replay if/when needed, it probably came from this game.