Or you can just settle for watching it on YouTube. The whole movie is there, in what seems to be a watchable print.
Yes, as has often been recounted, the way that Inspector Clouseau (and the animated Panther) took over the first movie was not expected in advance.
For me, the most interesting thing about A Shot in the Dark is that in origin, it's not a Clouseau story at all. A play of that title, set entirely in a courtroom (adapted from a French play titled The Idiot), had had a successful run on Broadway, and my understanding is that the studio had bought the rights without being quite sure how to use it as a film. Then with the success of The Pink Panther, they realized they had a ready-made French criminal-investigation story that could be quickly turned into a Clouseau sequel and filmed.
The cast of the original Broadway production is especially interesting (to me, at least). The eminent actress Julie Harris had one of her great successes as the sexy French maid -- some who saw it consider it her greatest (partly, I guess, because a farce like this was so different for her: she often played great ladies of history onstage, like Mrs. Lincoln or Emily Dickinson). The inspector was played by William Shatner. And the elegant Benjamin Beaurevers was played by the not-yet-famous Walter Matthau, so convincingly that he won a Tony award for the role.