<P> Rush were approached by Hamburg, a fan of the band, to appear in the film . The filming schedule was tight because there was a one - day window between two of their concerts on tour . The band later said that they enjoyed the experience . Hamburg felt that "once Rush got that I wasn't poking fun at them, that I'm genuinely a fan and the main characters of the movie are fans and it's kind of a loving tribute to them, I think that's when they came on board ." Subsequently, both Rudd and Segel appeared in character as Peter and Sydney alongside the members of Rush in a short video played at the end of concerts during the band's 2010 - 11 Time Machine Tour . In August 2013, Rudd reprised his character at the final show of Rush's Clockwork Angels Tour, conducting the Clockwork Angels Orchestra (a string section which accompanied the band) during the song "YYZ ." In 2015, on Rush's R40 Live Tour, Rudd and Segel were again featured among a number of celebrities in an accompanying rear - screen video lip - synching the rap section to the song "Roll the Bones". </P> <P> I Love You, Man received largely positive reviews, with critics mainly praising the chemistry between Rudd and Segel, as well as the supporting performances . </P> <P> Film review website Rotten Tomatoes gives it an overall approval rating of 83% based on 205 reviews, with an average rating of 6.9 / 10 . The website's critical consensus states, "I Love You, Man makes the most of its simple premise due to the heartfelt and hilarious performances of Paul Rudd and Jason Segel ." Metacritic gives it a weighted average score of 70% based on reviews from 34 critics . </P> <P> Giving the film three out of four stars, Peter Travers with Rolling Stone said that despite the formulaic plot, "It's the variations that Rudd and Segel spin on this theme that make the movie hugely enjoyable ." He also praised the supporting cast . Entertainment Weekly gave the film an A, and said that "Paul Rudd gives a startlingly funny and original performance ." USA Today gave the film a glowing review, stating "the movie works because everything hinges on the camaraderie and undeniable chemistry between Rudd and Segel ." More conservatively, People magazine said the movie "sails along on goodwill and blush - worthy bawdiness," but concluded that "like instant chocolate pudding, it goes down easy--even if it isn't especially good for you ." </P>

Who plays doug in i love you man