Hailey finds Burgess' hair band in garage where Voight beat Roy. But same hair band was shown to be cut when Kim was being prepared for surgery in hospital.
When Halstead is telling the others about Mark Irwin, he says that Irwin is 52. But seconds before, the computer screen showing Irwin's details has a date of birth listed as 10/18/1954, which would make him 67 in 2021 when this episode is set.