Virtually any TV show or movie will have consistency errors like that; you just have to know where to look.
The ones that bug me more than simple mistakes like those are the ones when something happens that is clearly impossible, such as someone walking (or even running) out of a fiery crash that totals their car and which have should either killed or crippled them but they wind up without a scratch - such as the villains in virtually every episode of the A-Team.
Smallville was another major offender; it was fine for Clark to be invulnerable, but half the time something potentially lethal happened it was to someone else than Clark and yet they still didn't get more than bruised>There are dozens of examples, such as the start of season 5 when a Zod-possessed Lex hurled Lionel into a car windshield clearly at super-speed, and yet Lionel was only bruised and dazed. Or when Clark was supposedly as powerless as any normal human when he had a blue kryptonite dagger shoved into his chest at the end of Season 8 and yet survived a fall off a tall building.
Of course, I'm citing shows that require a major suspension of disbelief to begin with, but even so...
My point being; minor inconsistencies are difficult to avoid, generally are honest mistakes, and are usually forgivable even when noticed at all (which most casual viewers probably will not). Major mistakes that anyone can spot without even trying to spot any however are simply pure laziness on the writer's part and insult the reader/viewer's intelligence. To me at least that's a huge difference. And modern movies are rife with them. For some prime examples, check out the great CinemaSins site (everything Wrong with [movie] in [x] minutes or less:
http://www.youtube.com/watch?v=K0Cho9We ... 5d2IIApNPjScreen Junkies (Honest Trailers)
http://www.youtube.com/watch?v=IFKu_bwM ... 97FD3CACCEor HISHEdotcom (How It Should Have Ended)
http://www.youtube.com/user/HISHEdotcom/videosAll of them are as funny as they are truthful about how flawed many movies are (two even dump on the 1939 version of The Wizard of OZ)!

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