  Leonard Hofstadter (played by Johnny Galecki) featured in every single episode of The Big Bang Theory over its 12-season run on CBS
 As such, the character was a firm fan favourite thanks to his marriage to Penny (Kaley Cuoco) and friendship with Sheldon Cooper (Jim Parsons)
 However, eagle-eyed fans have spotted a handful of plot holes which meant things didn’t quite add up with his story
The 3 biggest Leonard Hofstadter blunders3. Leonard’s spot on Stuart’s ‘Wall of Heroes’  In the seventh episode of season five, Leonard was dating Priya Koothrappali (Aarti Mann)
 However, it didn’t stop him from picking up the number of Alice (Courtney Ford) at the comic-book store
 Leonard and Alice kissed later in the episode resulting in him coming clean to Priya – although she’d also cheated on him while in India, resulting in the downfall in their relationship
 The plot hole here, however, stems from a conversation Leonard had with Stuart (Kevin Sussman) after getting Alice’s number
 Big Bang Theory: Who is Barry Kripke really named after?    READ MORE   The Big Bang Theory: Star spills all on meeting Queen Elizabeth II  Howard (Simon Helberg) asked if Leonard managed to get a girl’s number in the store, prompting Stuart to say: “Because if you did, you get your picture up there on the Wall of Heroes
” Leonard brushed off the flirty encounter before Stuart says: “Doesn’t matter. This is the closest anyone’s ever come
” Stuart appears to be forgetting a season two episode in which he, in fact, landed a date with Penny
 In the 20th episode of season two, Stuart’s charm meant Penny gave him her number – rendering his quote about the “Wall of Heroes” false
  2. Leonard’s trip to Comic-Con 2009  The same episode as Stuart’s “Wall of Heroes” blunder also saw Leonard make a mistake regarding the summer of 2009
 Leonard decided he would call Alice to hang out and when she was at his apartment, he showed her a picture he had drawn while at Comic-Con
 He said: “Check it out. Jim Lee drew this of me two years ago at Comic-Con – I’m Lion-O from Thundercats
” While the drawing got a big laugh from Alice, Leonard seems to be forgetting he was actually preoccupied during the time of Comic-Con 2009
   Two years prior to meeting Alice and at the same time Comic-Con would’ve taken place, Leonard wasn’t in the USA
 In fact, he was on an expedition in the Arctic during this time with Sheldon, Howard and Raj (Kunal Nayyar)
 Of course, there’s no saying Leonard didn’t return from the Arctic to attend Comic-Con and then head back
 However, judging by the complexities that would come with that trip and the fact it was never mentioned suggests otherwise
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 Leonard’s romance with Joyce Kim  In this episode, Big Bang fans are taken on a flashback to see when Leonard first moved into Sheldon’s apartment
 During the story, Leonard reveals the first time he took a girl home in the form of Joyce Kim (Ally Maki)
 Sheldon interrupted their moment of passion as Leonard didn’t give enough notice to inform him he would be bringing a girl home
 During the confrontation, Leonard says: “I didn’t even know her 12 hours ago.” However, in season two, episode nine, Leonard said he had dated Joyce Kim for almost a month
   
