Mayerling is a 1968 movie directed by Terence Young and starring Omar Sharif, Catherine Deneuve and Ava Gardner. The film is based on the real story of Austrian Crown Prince Rudolf and his mistress, Baroness Maria Vetsera, and their tragical death in the hunting lodge at Mayerling in 30 January 1889.
The following weapons were used in the film Mayerling:
A Mle 1892 Revolver is seen in hands of Crown Prince Rudolf (Omar Sharif) when he fires at bottles and mirrors, being drunk. The gun is anachronistic for late 1880s.
Smith & Wesson Military & Police
In the final scene at Mayerling Crown Prince Rudolf uses Smith & Wesson Military & Police revolver with 4" barrel that also doesn't fit for 1889 (in reality the revolver used during the Mayerling Incident was a Gasser-Kropatschek). A smaller version in .32 caliber is also possible but less credible as the revolver seems to be large enough for K-frame.
Unidentified revolvers
A pair of similar looking revolvers is briefly seen in Rudolf's apartments. They seem to have folding triggers.
Rifles
Mosin Nagant M1891 Rifle
The soldiers of the Austro-Hungarian army carry Mosin Nagant M1891 rifles, which is completely incorrect (Austrian infantry rifle in late 1880s was Steyr Mannlicher M1886, the predecessor of Steyr Mannlicher M1895). During the assassination attempt the shooter is also armed with a Mosin Nagant M1891 rifle.
Lebel Mle 1886
During the street riot in Vienna some soldiers carry rifles that appear to be French Lebel Mle 1886, never issued to Austro-Hungarian army.
Unidentified short rifle
During the riot in Vienna the soldiers carry short rifles of unidentified model. While their outlook is similar to Mannlicher M1895/30 short rifle, they seem to lack typical protruding magazines, and their front sight are of different shape, possibly hooded.
Unidentified rifle
Full lenght rifles that are possibly genuine Mannlicher M1895s are distantly seen in hands of soldiers in one scene.