As single-story series become more common, the filming schedule for series more closely resembles that of movies, where you film the entire thing at once. But some television series today still follow the episodic format. In the olden days, tv series were shot, and even written, on a schedule only slightly ahead of airing. In Ye Olde 22-episode American tv calendar, September-to-May, episodes of shows were being written and filmed while the season was on-air, maybe a couple of weeks ahead of the viewer. The one advantage to this was that the writers and cast could adjust, on-the-fly, to how the show was being received. There are some few instances of actors and characters being introduced with the intention of being in only one or two episodes, then becoming so popular with audiences that the plans were changed and the character or actor was made a regular part of the show. I know of at least one instance of the reverse: Harry Kim was going to written off Star Trek: Voyager, but then Garrett Wang was featured on the cover of People magazine and the writers changed their minds. They didn't know he was that popular.
On the industry side, we're seeing movie studios make more series, and streaming services are becoming production houses for features and series simultaneously, so those traditional distinctions are fading fast. In the US, each industry does still present its own awards every year, The Oscars and the Emmys, although we're seeing more and more instances of movies that should be considered by the Oscars (because, back in the day, "television movies" was a whole subgenre that were the purview of the Emmys, not the Oscars. iirc, Alfonso Cuaron's Roma was the first movie produced entirely by a streaming service to win an Oscar, so that distinction is tumbling down too). To my knowledge, the Oscars have never recognized anything that was a series.
The talent producing movies and television overlap now more than ever, but it's still not 100%. There are still a lot of actors and directors who only do movies, and even more who only do tv. As above, I don't know how much of that is due to differences in the techniques employed. Even if the techniques are no different, series still demand a lot from an actor in time commitment and shooting schedule. I was listening to an interview with Peter Dinklage recently, and when he was asked if he would ever do another series like Game of Thrones, he took a long pause trying find a 'diplomatic' answer... I think in a series, the shooting schedule can be more grueling, there's less time for reshoots or multiple takes, and less post-production. As more series are shot more like films, those differences will fade, but they're still there.
It's often been said that "movies are a director's medium and television is a writer's medium", and while that's not as 100% true as it used to be, it's still mostly true. I was just listening to an interview with James Gunn yesterday, and he said he can't imagine not personally directing a script he's written. He considers the directing of a movie to be "the final draft of the script." At the same time, some of these blockbuster movies are becoming so huge, we're seeing directing duos more and more often. Meanwhile, Kevin Smith says that when he directs an episode of a television, he's basically just the guy who brings the donuts. He asks the cast for pointers on what their characters ought to be doing in a scene, 'cause the actors are way more familiar with them than he is. There's a story that came out recently about a confrontation on-set between Ellen Pompeo and Denzel Washington when he came in to direct an episode of Grey's Anatomy. Washington hadn't done television in 40 years, and if I'm reading between the lines, it sounds to me like he may have forgotten that it wasn't a film set and the director doesn't run everything. A quote from Pompeo: "He was like, 'I'm the director. Don't you tell [your scene partner] what to do.' And I was like, 'Listen, mother[lover], this is my show. This is my set. Who are you telling? You barely know where the bathroom is.' And I have the utmost respect for him as an actor, as a director, as everything, but we went at it [that] day."