"I think a million concurrent streams will not work on top of normal video traffic, " said Graham Moore, from web traffic management firm Zeus Technology.

BBC: England fans set for web-only tie

Macy, Laurence Fishburne, Helen Hunt, Heather Graham and Demi Moore share screen time with younger talents such as Shia LeBouef, Joshua Jackson, Ashton Kutcher and Lindsay Lohan.

NPR: Ensemble Films Fill the Screen with Cameos