One VFX producer said that "Len was insisting on the fact that, because we've got Transformers and other big CG movies coming out, this one has to feel more real.

Visual effects were produced by visual effect supervisor Nicolas Chevallier, VFX producers Alain Lalanne and Edouard Valton, digital artists Mickael Goussard, Jean-Louis Kalifa, Julien Buisseret, Olivier Sicot, Nicolas Evrard.

In 2007, he served as visual effects supervisor for Kellogg's and Tropicana commercials, and as vfx producer for Cafe FX, working - amongst other projects - on the Hogwarts castle ride film for the new Harry Potter Island of Adventure at Universal Studios Florida.