Sergeant Siler incurs the first of many injuries he receives throughout the series in this episode when he gets electrocuted.
The prop used for the "shaped charge explosive" used to divert the wormhole and disconnect from the blackhole is actually a high fidelity woofer speaker.
Due to the time dilation close to the Stargate, the "20 second" countdown on the bomb takes 51 seconds. The last 3 seconds takes 12 seconds.
There is a scene where Captain Samantha Carter is offered a donut while trying to figure out the black hole scenario. She briefly considers it before putting it back in the box. Amanda Tapping got her start in a fairly well-known TV commercial for Tim Horton's back in the late eighties. This is the first of multiple donut gags in the series where characters are offered, yet decline, the fried pastries.