Cell Phones Are Useless: When Eli gets beamed up to the George Hammond, he pulls out his phone, telling Rush that he should probably call his mom. Rush tells him that his cell phone probably won't work in Earth orbit.
Naquadria, a highly unstable radioactive isotope of Naquadah, plays a key role in getting the Stargate on Icarus base to connect with Destiny.
The Tau'ri have built long-range communication devices modeled after the ones discovered in Stargate SG-1.
On at least two otheroccasions, when the stargate drew more power than normal, travelers were thrown out of the wormhole at high speed.
Earth-Shattering Kaboom: The fate of the planet that dialed Destiny, P4X-351. Justified because the planet's core is made of Naquadria, a highly unstable isotope of Naquadah that was shown to be highly radioactive and explosive even in small quantities.
Exact Words: O'Neill tells Eli quite frankly that that if he doesn't sign the non-disclosure agreement, they'll beam him up to their spaceship. Eli shrugs it off and shuts the door on him, and gets beamed aboard the George Hammond as he walks up the stairs back to his room.