Final answer:
The filmmakers faced challenges of weather conditions affecting shooting schedules and special effects coordination, which require technical expertise and can be costly and time-consuming.
Step-by-step explanation:
Two major challenges the filmmakers faced while producing a movie would likely relate to weather conditions and special effects coordination. Weather can impact shooting schedules and location accessibility, which can lead to delays and increased costs. Coordinating special effects, especially with advancements in technology like CGI, requires a high level of technical expertise and can be time-consuming and cost-intensive.
Moreover, filming sequences out of chronological order poses additional challenges for actors and directors in maintaining the continuity and emotional journey of the characters.