The scenes set in the Cratchit family house were filmed in a wine merchants which is still there. The particular building was next door to a car garage. The scene in which Scrooge visits and learns of Tiny Tim's death had to be reshot, owing to an extractor fan drowning out the actors' speech from the body shop on the other side of the wall.
This is possibly the only version of 'A Christmas Carol' in which Scrooge wears dress pants, dress shirt, vest, and smoking jacket instead of a nightshirt, slippers, and cap. Rumor has it George C. Scott openly railed at the idea of playing Scrooge in such a costume, especially in an English winter. In the book, Scrooge wears his shirt, pants, vest, dressing gown, and slippers. Scott's costume is very close to the book.
This is the only traditional adaptation of A Christmas Carol where Scrooge's father is seen onscreen. This version shows Scrooge and his father interacting outside the schoolhouse after Fan comes to fetch Ebenezer. It is a very interesting and informative scene for Scrooge's character development, showing how unconcerned his father feels towards him.
The word "humbug" is misunderstood by many people, which is a pity since the word provides a key insight into Scrooge's hatred of Christmas. The word "humbug" describes deceitful efforts to fool people by assuming a fake loftiness or false sincerity. So when Scrooge calls Christmas a humbug, he is claiming that people only feign charity and kindness in a scoundrel effort to delude him, each other, and themselves. In Scrooge's eyes, he is the one man honest enough to admit that no one really cares about anyone else, so for him, every wish for a Merry Christmas is one more deceitful effort to fool or take advantage of him. This is a man who has turned to profit because he honestly believes that everyone else will someday betray him or abandon him the moment he trusts them.