Gus Brown provided the voice of Paddington on-set during filming, before being replaced by Ben Whishaw in post-production.

Colin Firth was originally signed up to provide the voice of Paddington, but withdrew from the project in June 2014 as he and writer/director Paul King found that his voice was not quite right for the role. Ben Whishaw was announced as his replacement the following month.

Alongside those credited as the writers of the screenplay, the following are thanked in the film's credits for their help:

Julian Barratt
Gus Brown
Joe Cornish
Jon Croker
Roger Drew
Simon Farnaby
Jon Foster & James Lamont
Neil Gibbons & Rob Gibbons
Matt Haig
Jason Hazeley
Mark Huckerby
Graham Linehan
Joel Morris
David Nicholls
Nick Ostler
Robert Popper
David Quantick
Will Smith
Emma Thompson
Samantha Ellis

Javier Marzan, who appears as the Buckingham Palace Sentry, also stood in on-set as Paddington for the actors to work around.

D Lime were featured as the calypso band in the film.