Processed film has several anomalies

The digital camera recorded nothing unusual on Oct.31st so I feared there would be nothing unusual on the film cameras as well. Film shot on Oct.30th had nothing unusual on it. I still have not sent away the film shot Nov.1st. Pictures returned for the film cameras did show the strange round transparant anomalies. They are not as obvious as they were in the past but I blame that on the film. In 08 and o9 I used 400 speed film, this year I used the more common 200 speed. A note for next year, "Use 400 or 800 speed film" if you can find any. Anyway, back to the anomalies. They all showed up in the Front Parlour this time. Last year they were evident in the Parlour, Green room, and front stairs. This year they were found only in the Parlour. The anomalies appear on four shots. Only one is large and grabs your immediate attention. The big one appears on the parlour floor. There are four on the ceiling of the parlour in one shot; there is one on the front wall between the front windows; there are two in the upper corner of a window on the eastern wall. These two anomalies are just off the wooden framework at the top side of the window, but on the wall. I have no idea what causes these anomalies, but I find it quite strange that they only appear on certain dates of the year and primarily on Halloween. These anomalies do not look like the classic "spirit lights or disks" that are shown in paranormal publications. They are round, they have a definite ring around them but they can be seen through and the otherside side is there just a tad lighter. Professional photographers tell be they have no idea how they come about and the processing company assures me the immage is in the negative so it has to be something the camera has taken. I am curious to see if anything appears on the Nov. 1st photos.