Even though David Duchovny is credited in the title sequence, he does not appear in this episode.
Doggett says that one of the Indian medical documents is in Farsi. This makes absolutely no sense, as Farsi is not spoken in India. It is only spoken in Iran, a country thousands of miles away.
Not entirely true. See:
If Scully was so uncertain of the boy being the suspect, she should have ordered him to stop. And if he didn't then she could have just shot him in the leg or shoulder.
Doggett says that 'dead people don't tip' to Scully in relation to the first victim, however the victim never tipped the bell boy, just stared out the window until he left.
Scully: But it's what I saw. With my eyes, anyway. Do you know what it's like not to be able to trust your own eyes?
Doggett: Then why'd you shoot him?
Scully: Because it's what the boy saw. And in an instant I realized that it's what Mulder would have seen or understood.
Scully: Because that's just how he came at things... without judgment and without prejudice and with an open mind that I am just not capable of.
Doggett: It's been a long night. Give yourself a break. This whole thing doesn't make any sense.
Scully: No... it did. In some way, it did.
Scully: Not exactly. I ran a decay analysis to, uh, determine the time of death. Liver temperature, buildup of gases, extent of rigor-- routine stuff. It's not 100% accurate, but it gives us a range.
Doggett: What's the range?
Scully: 24 to 36 hours.
Doggett: Well, that's just wrong.
Scully: Well, it would mean that, uh, Mr. Potocki here would have died before he left Bombay.
Doggett: No. It would mean that a dead man boarded a plane in India, changed planes in Paris, hailed a cab at Dulles, and then checked into a downtown hotel and tipped the bellman. In my experience, dead men don't tip, Agent Scully.
Doggett: Big fella, isn't he?
Scully: Big is a relative term, Agent Doggett. It took three strong men to wheel him in here. He tipped the scale at 402 pounds.
Doggett: Uh, Hugh Potocki was a big man, big appetites. Loved big cars, big houses, big business. Divorced twice. He carried two alimonies, one with child support. Never missed a payment. In fact, he seems to have spoiled his wives and kids.
Scully: I'm missing the point.
Doggett: It seems he loved big women, too. Considering the evidence and motives we can probably rule out his ex-wives as suspects.
Scully: No. From what I see, Agent Doggett, from the way this man died... I doubt it was a kid who did this.
Doggett: Thanks. I'm not quite ready yet to lose all my faith in humanity.
Scully: But regardless, I'd say it's wise you keep an open mind.
Scully: So, basically what you're saying is that nobody knows anything.
Doggett: But then I guess that's why it's in your in-box. So, what do you think, Agent Scully? Haunted hotel room? Alien invaders? Sloppy vampires?
Scully: Maybe if I could see through Mulder's eyes I could understand.
Scully discovers that a chemical spillage at a village called Vishi was the catalyst for the Indian mystic's vengeance. This is a reference to the Bhopal incident in 1984 where around 8,000 people died in the few weeks after the Union Carbide plant accidentally released a large amount of methyl isocyanate gas.
'Badlaa' is a word in Urdu (a language spoken in India) for exchange/retaliation/revenge.