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I'm ate 900 calories yesterday when I normally eat 400, and I gained .5 pounds....?

I'm seriously confused.

For a while now I've been eating from 400-500 calories every day [I know it's bad for me, I have been losing weight], but recently I think I reached my weight plateau so I googled stuff about it, and advice came up to vary my calorie intake. I decided I might try it.

SO yesterday I ate 900 calories because I knew I couldn't gain weight because I still burn more calories than that naturally, but I was wrong.. this morning when I stepped on the scale it said I gained a little more than a half pound.

Please can someone explain to me why this happened? [and give me some advice on how to get off of this plateau]

A pound of fat is composed of about 3500 calories.  A pound of muscle has about 600 calories in it.

If you consumed about 400-500 more calories than normal then it's probably water weight (+ maybe the little food you've eaten still in your intestinal tract).

I'm not going to preach to you about how you need to eat more calories because well, I believe you already know that, not to mention everyone else has already hammered it into your head if you didn't. 

I understand though that you wont increase your calories if it means gaining weight, which it will if you do it too quickly.  Try gradually increasing your intake... maybe by 100 calories a week.  All next week consume 500 a day, then the following week 600 a day, or whatever works for you.  This way your body will slowly get used to it and back to a healthy state.  Hopefully this will prevent sudden weight gain and the chances of you relapsing back to 400 calories because you wont be able to survive off that for very long, sooner or later you will have to eat more... just sooner is better before too much harm is done.