Original prime time network airings were an hour-long block, usually with 4 stories that were about 15 minutes each. Many syndicated versions were only half an hour, with 2 stories.
Some syndicated versions "cut up" the longer stories and aired them in a cliffhanger "to be continued" format, something the original airings never did.
In the New Zealand transmissions of Rescue 911, before the intro sequence. William Shatner appeared and told viewers that the emergency number to call in New Zealand is 111.