Mattfeld had to put in extra work to do her role justice. In an interview with Colldier.com, Perry said that she spent a lot of time with the blind consultant Lorri Bernson as she prepared to step into the character’s skin.
'I would observe Lorri as she went about her daily routine. I saw how she cooked, got ready for bed, used her iPhone on audio settings and interacted with her guide dog. I also learnt how to use a cane. Lorri helped me greatly with blocking. The director would say what he wanted to be done, and then Lorri would illustrate. I would then copy how she moved.'
Apart from Bernson, Mattfeld spent a lot of time bonding with her on-screen guide dog, a golden retriever called Levi.
'She's so special and definitely the lead,' Perry praised her four-legged co-star. 'Levi, who plays Pretzel, was a source of education to the entire crew on how service dogs work with their owners. We also learnt how to have Levi on camera.”