Writer Stel Pavlou was working as an assistant in a liquor store when he penned his screenplay. It was sent on spec to Tim Roth as Pavlou knew that Roth insisted on reading all independent scripts sent his way.
When Dakota and Felix are fooling around in the bath-tub, they throw their underpants onto the floor. Yet Felix still is wearing white underpants, visible for some seconds when he's turning around in the tub.
Elmo: [explaining his new drug to Durant]
MDMA utilizes Serotonin. Opiates, like heroin, utilize dopamine. Sort of like the same sensation you get after sex. Amphetamines increase adrenaline. And cocaine gets those synapses in the brains firing really fast. My product is 51 times stronger than cocaine, 51 times more hallucinogenic than acid, and 51 times more explosive than ecstasy. It's like getting a personal visit... from God!