Corrected entry: When Carter is taking out the marker in the blood left by Jallinar, she uses a centrifuge. That will work great except that she didn't balance it by putting a test-tube or something else (water will work fine) on The Other Side. It's possible that she goofed up, Fraiser was walking her through it and everything, but I doubt it. If she did just have a slip of the memory, the centrifuge would only shake and maybe fall off the table, we don't see if it did or not.

Stargate SG-1 (1997)
1 corrected entry in Legacy
Revelations - S5-E22
Revealing mistake: Just before Teal'c and O'Neill get to the engine room door, Carter can be seen hiding around the corner. (00:27:40)
Aris Boch: Doctor Jackson, if you don't mind treating my wound.
Daniel Jackson: I'm an archaeologist.
Aris Boch: I know. But you're also a doctor.
Daniel Jackson: Of archaeology.
Aris Boch: Never mind. Captain, you must have some medical training.
Samantha Carter: Actually, I'm a major now.
Aris Boch: Oh, well, how very important. I'll inform the galaxy.
Trivia: Dom DeLuise and his three sons Peter DeLuise (who has written, directed and produced a number of episodes), Michael DeLuise and David DeLuise have all appeared on the show at least once. Peter DeLuise has appeared many times.
Question: Why did Richard Dean Anderson leave what was a very popular show?
Answer: While the series was undeniably successful, filming it is a long process, taking many months of often long days. Anderson, after several years of doing this, wished to spend more time with his young daughter, who he felt he was neglecting, and requested that his role in the series be scaled back. Ultimately, he decided to leave the main cast altogether and only make occasional guest appearances.
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Correction: There are centrifuges that will self balance or have a heavy weighted base that don't need balancing. They are VERY expensive and you don't see them that often. Considering the importance of the SGC, it wouldn't be out of place to have one there.
Grumpy Scot