As the DVD of [movie id="307087"]"Harry Potter and the Half-Blood Prince"[/movie] hits shelves Tuesday (December 8), the first peeks at the next and final films in the series -- the two parts of "Deathly Hallows" -- have begun to hit the Web: two photos and even a teaser trailer.

Behind that pristine multimedia, however, lies a production still very much in flux, as the cast told MTV News in recent interviews. Perhaps "flux" is even putting mildly, compared to star [movieperson id="264615"]Daniel Radcliffe[/movieperson]'s characterization.

"It's chaos and it's fear and we're terrified we're not going to get it right, and it's absolute madness with rewrites and script changes and scripts not being written and then coming," he said with a smile. "It's just mad."

But Radcliffe and the "Potter" cast and crew have been this way before, and it all seems to work out in the end. The six films in the franchise have grossed more than $1.7 billion domestically.

"Amidst all that, something wonderful hopefully will emerge," Radcliffe said. "That's what I quite like about the film industry. Chaos bears something so cool and great and polished out into the world."

As the craziness of a film production swirls around them, the "Potter" cast -- the nucleus of which has been in place for almost a decade -- has been enjoying the chance to reunite on camera and after shooting wraps each day.

"It's been amazing to keep the core group of us here since the beginning," said Bonnie Wright, who plays Ginny Weasley. "No one's been left or changed. I think that dynamic has developed year to year. There's a safeness when you come back to the film. It's like coming back to school."

Exactly, and sometime schoolmates dole out a bit of good-natured name-calling to one another, as is the case with Rupert Grint, following his much-publicized illness this summer.

"It's been great seeing Rupert again, whose nickname is now Pigboy Heart Attack, after his bout with swine flu," Radcliffe laughed.

Check out everything we've got on "Harry Potter and the Deathly Hallows: Part 1."

For breaking news, celebrity columns, humor and more -- updated around the clock -- visit MTVMoviesBlog.com.