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.
This is the first episode where the SG team's transmitter for opening the iris is referred to as the GDO. GDO is not a technical term, it stands for "Garage Door Opener".