These E Numbers are to be avoided as they are definitely of animal origin.

 E120 – Carmine Dye from Cochineal Beetles, Natural Red 4
 E441 – Gelatine
 E542 – Edible Bone Phosphate
 E901 – Beeswax, white and yellow
 E904 – Shellac – Resin from Lac Bug
 E910 – L-cysteine
 E913 – Lanolin, sheep wool grease
 E920 – L-cysteine
 E921 – L-cysteine
 E966 – Lactitol

Source: http://elated.co.za/which-e-numbers-are-vegan/