Marketic It's no definitive masterpiece but it's damn close.

UnowPriceless hyped garbage

Fairaher The film makes a home in your brain and the only cure is to see it again.

Bumpy Chip It’s not bad or unwatchable but despite the amplitude of the spectacle, the end result is underwhelming.

ags123 This William Castle fright film has none of his signature gimmicks, relying instead on a rather thin plot for its suspense. It may have been scary half a century ago, but the world has changed and today it all comes off as rather juvenile. The acting by the two teenaged girls is horribly stilted and the young sister is mostly annoying. John Ireland and Joan Crawford get to show off their acting chops, but are stymied by a poor script and plodding direction. Joan is always interesting to watch, but her part is small and that intricate hairdo is far too distracting. So are the ever-present shadows that conveniently hide her 60-year-old neck. The crisp black and white photography is excellent, but the film's low budget is painfully evident. "I Saw What You Did" provides some campy, dated entertainment, but not much else to recommend it.

PrometheusTree64 Clearly, William Castle was no great director, certainly no Hitchcock, but this silly little gem of a B-movie works better than most Castle movies because the camera man, Joe Biroc, gives the picture a macabre dignity mostly lacking in Castle's other work as a director... (Just imagine if Castle's first movie with Joan Crawford, STRAIT-JACKET, a film with obvious potential, had been photographed by Biroc and all its sloppy, slipshod flaws were obscured -- it would have wound up the masterpiece Castle had hoped it would be, instead of a tacky cult curio). I SAW WHAT YOU DID presents a cozily idyllic, B&W, semi-rural, claustrophobic alternative reality at midnight, what with the split-level house on a hill in the middle of a really cool farm, and Crawford and John Ireland competing in the Who's Creepiest sweepstakes... and William Castle even uses a very effective fog in the latter scenes which makes me wonder why none of the other grand dame guignol pictures ever did that, not even HUSH... HUSH, SWEET CHARLOTTE (which Biroc also shot). So ISWYD works on atmosphere and good-naturedness.

floweracres The next time you are hosting a sleep-over, put this one on for the girls! Grab some pop-corn and settle in for a fun time :) I honestly really enjoyed this movie. It is a refreshing break from modern films guts and gore, a flash-back to a simpler time - truly entertaining! Love it!

Scott LeBrun This fairly well made and entertaining William Castle shocker stars Andi Garrett and Sara Lane as Libby and Kit, two teenage girls who hang out at Libby's isolated country home when Libby's parents go on an overnight trip. Kids being kids, their idea of entertainment is picking random names out of the phone book and pestering the people with prank calls. Their worst mistake is when they dial up Steve Marak (John Ireland), and utter the memorable lines, "I saw what you did, and I know who you are." As fate would have it, Marak has just murdered his wife! While Marak spends his time covering up his crime, fending off the advances of his oversexed neighbour Amy Nelson (Joan Crawford), and desperately trying to get back in touch with the so-called "witnesses", the girls buy themselves more trouble by casing Steve's joint.This isn't as enjoyable overall as this viewer would have liked. Castle isn't able to derive *that* much tension from the set-up, and the phone hijinks go on for a little too long. He also tries to balance a playful approach in the scenes with the girls with a more serious tone in the scenes with Ireland. The music score by Van Alexander is no help; sometimes it's just too jaunty.Fortunately, the scenario gets more gripping as it plays out, and Castle finally delivers a decent suspense finale at the Mannering family homestead. Another major asset is extremely stark and atmospheric black & white cinematography by Joseph F. Biroc. The performances are solid from all concerned. Garrett and Lane create two reasonably engaging and upbeat characters. Ireland is fun as a stone cold psycho, and Crawford is effective as the woman who yearns to be with him. Leif Erickson, Patricia Breslin, John Archer, John Crawford, and Tom Hatten comprise the supporting cast, with Joyce Meadows contributing a brief cameo as the murder victim. The actual scene of her being killed is an obvious "Psycho" riff, but amusing.Worth a look for thriller fans.Remade for TV in 1988.Seven out of 10.