Crowning Music of Awesome: Pretty much the whole album, which is especially noteworthy as it's over 90 minutes long, which means that today, it can't even fit on a single CD. Keep in mind this was an album made in 1974.
Epic Riff: Mostly on keyboards, see "In The Cage", "Back in N.Y.C.", "Carpet Crawlers", "The Raven", and "Riding the Scree".
Special Effects Failure: In an interview, Collins mentioned the various technical and costume failures made the show unintentionally hilarious and the reason the Broadway show had a short run time. He also expressed irritation that half the time, Gabriel's costumes interfered with his singing.
Tony Banks is on record as saying that he doesn't think there was a single show where everything worked correctly.
Vindicated by History: It wasn't reviewed well at the time, as it tanked on the charts and savaged by practically everybody, including the band, but now is regarded as one of the masterpieces of Progressive Rock and one of the band's best recordings. Allmusic even gave it their highest rating of five stars.
What Do You Mean, It Wasn't Made on Drugs?: Both the album itself and the surreal, fantastical stage show that resulted. Genesis, as (mostly) former boarding school students, were in fact one of rock's least intoxicated bands of their time, and were not normally followers of the rock and roll lifestyle (though they were possibly not entirely untouched by drugs or alcohol in their lives). Gabriel often jokes of the band rebelling by "removing the paper covers of the soap at the hotel" in the middle of the night.
Phil claims that as the Lamb tour dragged on and on, he eventually took to getting stoned backstage before going on — he specifically chose to smoke grass because, unlike booze, it had no noticeable effect on his drumming.
Phil helped write and arrange some of the music for The Lamb along with the other Genesis members, but Peter Gabriel, by his insistence of wanting a necessary story, wrote all of the lyrics and concept (albeit not at the band sessions, as he was busy tending to his troubled marriage and his incubated newborn daughter), save for "The Light Dies Down On Broadway", which Tony and Mike wrote the words for when Peter got writer's block. Gabriel was, for the most part, drug-free.