It doesn't matter whether He went through a wall or a door. What matters is how He got there. Read post 98 and you'll see just what I mean. Many believe Jesus could go through walls with His "resurrected body". From this they conclude that they too, will he able to go through walls with their "resurrected body". However, if, on the other hand, God miraculously put Him there, then He couldn't go through walls with His "resurrected body" and as such Christians won't be able to do it either.
This is how erroneous teachings start. Someone misunderstands something in the Scriptures, draws a conclusion, and then forms a belief based on that conclusion. Often that belief becomes the basis for other beliefs and before we know it people are out in left field.
Now, I think the reasonable person would look at this passage and say, I don't know how He got there. It could be, as some have suggested, that He had the ability to walk through matter. However, it could also be that God miraculously put Him there. We simply don't know. But, I think when we say this is the way it happened, we are in danger of being wrong and then subject to further error based on the first error.
That's why I think it matters