I have found an interesting addition in the codex Bezae in both the Latin and Greek of John 6:56. Here is a comparision between the Bezae and Vulgate with the Bezae on top and Vulgate below, and my translation below them. The addition is in red.
56 qui edet meam carnem et uibet meum sanguem in me manet et ego in eum.* sicut in me Pater et ego in Patre amen amen dico uobis nisi acceperitis corpus fili hominis sicut panem uitae non habetis uitam in aeo
qui manducat meam carnem et bibit meum sanguinem in me manet et ego in illo
Bezae reads: He that eats my flesh and drinks my blood abides in me: and I in him. Just as the Father is in me and I am in the Father, amen amen I say to you, unless you receive the body of the Son of Man as the bread of life, you have no life in you.
Vulgate reads: He that eats my flesh and drinks my blood abides in me: and I in him.