[Radii]

From the Sepinwall review of the episode

the episode opened with an eye-popping sequence that goes up there with some of the more impressive shots the parent show ever gave us, and one that was very intentionally evocative of the opening of Orson Welles' Touch of Evil, which offers one of the more famous one-take sequences in movie history.

According to "Fifi" writer Thomas Schnauz, he and the rest of the creative team had Touch of Evil in mind as they set up their own border crossing, and the percussion is extremely reminiscent of the Touch of Evil score. But the idea to actually film it in one take — covering so much ground and moving around so many tight spaces — was all from director Larysa Kondracki. It did a neat job of not only paying homage to Charlton Heston and Janet Leigh making a similar crossing (with an explosion, to boot), but also establishing how thoroughly the border police seemed to do their job in searching the ice cream truck, even though they fail to find the contraband that's being brought to Hector Salamanca. In that way, it felt like a magician rolling up his sleeves or sliding a hula hoop across the levitating woman as a way to prove there's no trickery going on, even though we in the audience understand that there's much more going on than we can see from where we're looking.