Theory:Doctor Who television discontinuity and plot holes/The Doctor's Wife
Why was this episode titled, "The Doctor's Wife" ?
It was pretty clearly established that the TARDIS has had unrequited feelings for the Doctor for centuries. The Doctor wasn't fully aware of those feelings even though he returned some affection, in the way that someone has affection for an old trusty possession. Once the Doctor was made aware of the TARDIS' feelings for him, he began to understand and reciprocate those feelings. The term "Doctor's Wife" refers to the fact that the TARDIS and the Doctor have always been together, developing a deep bond, linking them as partners throughout time and space.
Telepathic Interface
Since the interface to the TARDIS is telepathic the security code "Crimson, Eleven, Delight, Petrichor" naturally has to be thought to be used .. but .. wouldn't this "interface" actually be a form of communication with the living entity that is the TARDIS?! Which would mean Amy was thinking it at House at the time, so why didn't it just block access? Yeah, probably because he was curious about this room it couldn't see before by itself. Still, I found it one of the (recently very frequent) occasions where I was pulled out of my (ever decreasing) willing-suspension-of-disbelief. What do you think?