Descriptions will be handled differently. You may describe what a character is wearing or doing hundreds of times. You may describe familiar scenes dozens of times in different ways. You'll have things that are familiar, that the reader can come to count on by your description of them. Use more descriptive words, and be careful not to let it get stale.
Familiarity is a big one.
The characters will say things that become speech patterns. Readers will come to have expectations about their routines, the places they are, the way they'll react in a certain situation, what they might say to someone, etc. In a shorter piece, there is not enough time to develop these little characteristics. Dialogue is another tricky bit. It needs to be much more complex than in shorter pieces.