I Love You Again is such a confident success–the whole thing rests on William Powell and everything he does in the entire picture is fantastic–it’s hard to think of anything wrong with it. It moves beautifully, its ninety-nine minutes sailing by, the supporting cast is all excellent and every one of its big comic scenes work.

The film’s premise–Powell as a teetotaler who, following a hit on the head, discovers he’s really a con artist–is well-suited as a vehicle for he and Myrna Loy. Loy plays the divorcing wife–bored with the teetotaler–who finds him a changed and intriguing man. I Love You Again comes about seven years after their first pairing and the two work in absolute unison, allowing the narrative to do without added exposition.

Watching Powell pursue Loy–and run afoul of her new beau, played by Donald Douglas (in one of the film’s only weak performances)–is delightful, with their pre-existing film partnership part of the agreed upon amusement. And it’s their filmic relationship, the one playing out in I Love You Again, where the film gets overconfident. It assumes the viewer will take that relationship for granted to a degree; the romance, which becomes the film’s driving force, isn’t the biggest plot foil.

Instead, there’s an elaborate con going on. The con’s good and beautifully handled–it’s a shame Edmund Lowe doesn’t have more scenes, but Frank McHugh’s great as Powell’s sidekick–but it confuses the film’s effectiveness. Loy’s hardly in the film’s last third, just because there’s an elaborate and hilarious set-up for the con involving Powell dressed up as a Boy Scout. Because the sequence is so good–and because Loy and Powell do have a nice scene dealing with the romance plot following it–as the film plays, it isn’t clear how much time Loy’s been off-screen.

The first half of the film, filled with some of its best comic scenes–there’s a great dinner scene with Powell, Loy and Douglas, another scene with Powell and Loy shopping–is heavy on Loy. She’s an integral part of the experience and to put her off-screen because it’s workable is bothersome (I know I’m harping on it, but Loy doesn’t get a very good close).

In some ways, this pairing is more convenient than collaborative. Powell gets to do physical comedy, play two wildly different parts (the teetotaler being completely against type for him) and gets to work with McHugh. He and Powell have a great chemistry and McHugh gets most of the film’s best lines; his character is the only one free of a real narrative.

But the film viewing experience itself is so joyful, it’s hard to identify the shortcuts the filmmakers are taking while watching. The film’s a superior diversion and the slightly less than filling feeling takes a few minutes to set in. During, there are a few moments where it’s clear Van Dyke’s not really giving the direction his all. Some of the camera set-ups are identical–even if they frequently do have some excellent cuts–and he’s not really trying. He doesn’t have to, not with the material, not with the cast, but it’d have been something if he had.