If Rocket Grab is cast and Blitzcrank moves, his hand will disappear as it has not been retracted yet.
Blitzcrank's style of play bears a resemblance to the DotA character, Pudge. This is mostly due to Blitzcrank's Rocket Grab skill and Pudge's Meat Hook having similar mechanics.
Though Blitzcrank uses his right arm for Rocket Grab, the picture used for it displays his left hand.
His dance is a reference to the Macarena, a popular Spanish song.
Blitzcrank's lore is similar to that of the Bicentennial Man, a movie based on a short story by Isaac Asimov, where the main character is a sentient robot played by Robin Williams.
Blitzcrank's name consists of 'Blitz', a German word for lightning, and 'crank', an English word denoting turning parts of machinery, starting-levers in particular.
Quotes
Blitzcrank's quote, "Exterminate" is a reference to the popular villains in Doctor Who, The Daleks.
This may also be a reference to Evil Robots in movies, who have a tendancy to say "Exterminate".
The quote: "A rolling golem gathers no rust" is derived from the adage "A rolling stone gathers no moss".
Blitzcrank's quote: "The magic calls to me" is almost exactly like a quote from Veigar: "The magic, it calls to me!".
Skins
Rusty Blitzcrank is one of the only non-limited edition event skins to be removed from the store, ostensibly because of low quality, as it was almost identical to his basic skin.
Piltover Customs Blitzcrank was the first skin presented by GANK Industries, though that information was classified until April 2.
The boxing gloves for Boom Boom Blitzcrank have the acronym "LOL" on one and the word "PWN" on the other.
The Goalkeeper Blitzcrank skin, along with the soccer skins for other champions, appeared just before the 2010 World Cup started, and were removed from the store on October 31, 2010
The iBlitzcrank skin is likely a reference to the I, Robot movie featuring Will Smith, but it is more likely a reference to the company Apple and their brand of "iTech". (iPhone, iPad, etc.) This is likely due to the imminent release of League of Legends Mac client, currently in beta testing on the PBE.
Relations
Blitzcrank was originally created by Viktor but the credit for his work was stolen by Professor Stanwick.